Cisco Preferred Architecture for Enterprise Collaboration 10.x

Cisco Preferred Architecture for Enterprise Collaboration 10.x

Cisco Preferred Architecture for

Enterprise Collaboration 10.x

Design Overview

Revised: January 22, 2015

© 2014-2015 Cisco Systems, Inc. All rights reserved.

Preface

Contents

Preface .......................................................................................................................................................... 4

Documentation for Cisco Preferred Architectures ..................................................................................................... 4

About This Guide ...................................................................................................................................................... 4

Introduction .................................................................................................................................................... 5

Technology Use Cases ............................................................................................................................................. 5

Architectural Overview .............................................................................................................................................. 6

Virtualization and Core Applications .......................................................................................................................... 8

Cisco Business Edition 7000 ........................................................................................................................... 8

Core Applications............................................................................................................................................. 8

High Availability ............................................................................................................................................... 8

Sizing Considerations ...................................................................................................................................... 9

Licensing ......................................................................................................................................................... 9

Cisco Integrated Services and Aggregation Services Routers ................................................................................ 10

Endpoints ..................................................................................................................................................... 11

Recommended Deployment .................................................................................................................................... 12

Call Control .................................................................................................................................................. 13

Recommended Deployment .................................................................................................................................... 14

Benefits ................................................................................................................................................................... 14

Deployment Best Practices ..................................................................................................................................... 14

Cisco Unified Communications Manager and IM and Presence Service ....................................................... 14

Cisco Unified Survivable Remote Site Telephony.......................................................................................... 15

Dial Plan ........................................................................................................................................................ 16

Multi-Cluster Deployment Considerations ...................................................................................................... 18

Conferencing ............................................................................................................................................... 19

Recommended Deployment .................................................................................................................................... 20

Audio and Video Conferencing ...................................................................................................................... 20

Benefits ................................................................................................................................................................... 20

Deployment Best Practices ..................................................................................................................................... 21

Audio and Video Instant Conferences ........................................................................................................... 21

Permanent Conferences with Cisco Collaboration Meeting Rooms (CMR) Premises ................................... 21

Scheduled Audio Conferences ...................................................................................................................... 22

Scheduled Video Conferences ...................................................................................................................... 22

Cisco Collaboration Meeting Rooms (CMR) Hybrid ....................................................................................... 24

Cisco Collaboration Meeting Rooms (CMR) Cloud ........................................................................................ 24

Support for Multiple Call Processing Sites .............................................................................................................. 25

Collaboration Edge ...................................................................................................................................... 26

Recommended Deployment .................................................................................................................................... 27

Headquarters ................................................................................................................................................. 27

Remote Sites ................................................................................................................................................. 27

Teleworker Sites ............................................................................................................................................ 27

Benefits ................................................................................................................................................................... 27

Deployment Best Practices ..................................................................................................................................... 27

Cisco Expressway ......................................................................................................................................... 27

Connectivity for Audio and Video over the Internet ........................................................................................ 29

PSTN Gateway .............................................................................................................................................. 30

Cisco Preferred Architecture for Enterprise Collaboration 10.x PAGE 2

Preface

Applications ................................................................................................................................................. 32

Cisco Unity Connection ........................................................................................................................................... 33

Recommended Deployment .......................................................................................................................... 33

Benefits .......................................................................................................................................................... 33

Deployment Best Practices ............................................................................................................................ 33

Cisco TelePresence Management Suite and Extensions ........................................................................................ 34

Recommended Deployment .......................................................................................................................... 34

Benefits .......................................................................................................................................................... 35

Tools for Application Deployment ............................................................................................................................ 35

Appendix ...................................................................................................................................................... 36

Product List ............................................................................................................................................................. 36

Cisco Preferred Architecture for Enterprise Collaboration 10.x PAGE 3

Preface

Preface

Cisco Preferred Architectures provide recommended deployment models for specific market segments based on common use cases. They incorporate a subset of products from the Cisco Collaboration portfolio that is best suited for the targeted market segment and defined use cases. These deployment models are prescriptive, out-of-the-box, and built to scale with an organization as its business needs change. This prescriptive approach simplifies the integration of multiple systemlevel components and enables an organization to select the deployment model that best addresses its business needs.

Documentation for Cisco Preferred Architectures

Cisco Preferred Architecture (PA) Design Overview guides help customers and sales teams select the appropriate architecture based on an organization’s business requirements; understand the products that are used within the architecture; and obtain general design best practices. These guides support sales processes.

Cisco Validated Design (CVD) guides provide details for deploying components within the Cisco Preferred

Architectures. These guides support planning, deployment, and implementation (PDI).

Cisco Solution Reference Network Design (SRND) guide provides detailed design options for Cisco Collaboration.

This guide should be referenced when design requirements are outside the scope of Cisco Preferred Architectures.

About This Guide

The Cisco Preferred Architecture for Enterprise Collaboration is for:

Sales teams that design and sell collaboration solutions

Customers and sales teams who want to understand the overall collaboration architecture, its components, and general design best practices

Readers of this guide should have a general knowledge of Cisco Voice, Video, and Collaboration products and a basic understanding of how to deploy these products.

This guide simplifies the design and sales process by:

Recommending products in the Cisco Collaboration portfolio that are built for the enterprise and that provide appropriate feature sets for this market

Detailing a collaboration architecture and identifying general best practices for deploying in enterprise organizations

For detailed information about configuring, deploying, and implementing this architecture, consult the related CVD documents on the Design Zone for Collaboration .

Cisco Preferred Architecture for Enterprise Collaboration 10.x PAGE 4

Introduction

Introduction

In recent years, many new collaborative tools have been introduced to the market, enabling organizations to extend collaboration outside the walls of their businesses. Providing access to collaborative tools for employees outside the office is no longer a luxury; it is mandatory for businesses to stay relevant in today’s market. Today’s users expect immediate access to these tools from a wide variety of portable and mobile devices. Many of these same tools can be extended to customers and partners, helping strengthen these relationships.

Organizations realize the added value that collaboration applications bring to their businesses through increased employee productivity and enhanced customer relationships. Not long ago, interoperability among collaboration applications was sparse, and applications were difficult to deploy and use. Since then, significant advances have been made in the collaboration space, simplifying deployment, improving interoperability, and enhancing the overall user experience. Additionally, individuals have adopted a wide variety of smart phones, social media, and collaboration applications in their personal lives.

Organizations can now feel comfortable providing collaboration applications that employees will quickly adopt and that provide maximum value. These new collaboration tools enhance an organization’s overall business processes, make its employees more productive, and open the door to new and innovative ways for communicating with business partners and customers.

Today’s collaboration solutions offer organizations the ability to integrate video, audio, and web participants into a single, unified meeting experience.

Technology Use Cases

Organizations want to streamline their business processes, optimize employee productivity, and enhance relationships with partners and customers. The Cisco Preferred Architecture (PA) for Enterprise Collaboration delivers capabilities that enable organizations to realize immediate gains in productivity and enhanced relationships. Additionally, the following technology use cases offer organizations opportunities to develop new, advanced business processes that deliver even more value in these areas:

Consolidate Communications Infrastructure

— Bring together voice, video, and data into a single IP network to simplify management and support effective communications.

Incorporate Video into Meetings

— Improve communications, relationships, and productivity by making it easier to meet face-to-face over distance.

Extend Telephony with Video

— Facilitate face-to-face video communications directly from end-user phones or softphone applications.

Support Teleworkers and Branch Offices

— Let employees work from multiple locations, whether satellite offices, home offices, or when traveling.

Collaborate with External Organizations

— Easily share information, interact in real time, and communicate using technologies beyond email and telephone.

Create Flexible Work Areas and Office Spaces

— Scale office space and create work areas that foster employee inclusiveness, collaboration, innovation, and teamwork.

Deploy a Unified Communications Architecture

— Provide the entire global organization with a single communications tool set for all users.

Information about Cisco Collaboration Technologies and use cases is available on Cisco.com

.

Cisco Preferred Architecture for Enterprise Collaboration 10.x PAGE 5

Introduction

Architectural Overview

The Cisco PA for Enterprise Collaboration provides end-to-end collaboration targeted for deployments larger than 1,000 users. This architecture incorporates high availability for critical applications. The consistent user experience provided by the overall architecture facilitates quick user adoption, enabling an organization to recognize immediate value for its investment. Additionally, the architecture supports an advanced set of collaboration services that extend to mobile workers, partners, and customers through the following key services:

Voice communications

Instant messaging and presence

High-definition video and content sharing

Rich media conferencing

Enablement of mobile and remote workers

Business-to-business voice and video communications

Unified voice messaging

Because of the adaptable nature of Cisco endpoints and their support for IP networks, this architecture enables an organization to use its current data network to support both voice and video calls. In general, it is a best practice to deploy a collaboration solution with proper quality of service (QoS) configured throughout the network. Voice and video IP traffic should be classified and prioritized to preserve the user experience and avoid negative effects such as delay, loss, and jitter. For more information about LAN and WAN QoS, see the Cisco Collaboration SRND .

The Cisco PA for Enterprise Collaboration, shown in Figure 1, provides highly available and secure centralized services.

These services extend easily to remote offices and mobile workers, providing availability of critical services even if communication to headquarters is lost. Centralized services also simplify management and administration of an organization’s collaboration deployment.

Cisco Preferred Architecture for Enterprise Collaboration 10.x PAGE 6

Figure 1. Cisco Preferred Architecture for Enterprise Collaboration

Introduction

Table 1 lists the products in this architecture. For simplicity, products are grouped into modules to help categorize and define their roles. The content in this guide is organized in the same modules.

Table 1.

Components for the Cisco Preferred Architecture for Enterprise Collaboration

Module

Call Control

Component

Cisco Unified Communications Manager (Unified

CM)

Cisco Unified Communications Manager IM and

Presence Service

Cisco Integrated Services Router (ISR)

Description

Provides endpoint registration, call processing, and media resource management

Provides instant messaging and presence services

Endpoints

Conferencing

Cisco Unified IP Phones, Cisco TelePresence video endpoints, and Cisco Jabber

Cisco TelePresence Conductor

Cisco TelePresence Server

Cisco WebEx Software as a Service (SaaS)

Cisco WebEx Meetings Server

Collaboration Edge

Cisco Expressway-C

Provides Survivable Remote Site Telephony (SRST) functionality

Enable real-time voice, video, and instant messaging communications for users

Manages conferencing resources

Provides audio and video conferencing resources

Provides subscription-based web conferencing delivered through

WebEx Collaboration Cloud

Provides on-premises WebEx conferencing solution

Cisco Expressway-E

Enables interoperability with third-party systems and firewall traversal

Supports remote endpoint registration to Cisco Unified CM and enables business-to-business communications

Cisco ISR Provides either public switched telephone network (PSTN) or

Cisco Unified Border Element (CUBE) connectivity

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Introduction

Module

Applications

Component

Cisco Unity Connection

Cisco TelePresence Management Suite and extensions

Cisco Prime License Manager

Cisco Prime Collaboration Deployment

Description

Provides unified messaging and voicemail services

Provides scheduling, web conferencing integration, and other advanced video features

Provides simplified, enterprise-wide management of user-based licensing, including license fulfillment.

Assists in the management of Unified Communication applications. It allows the user to perform tasks such as migration of older software versions of clusters to new virtual machines, fresh installs, and upgrades on existing clusters.

Virtualization and Core Applications

Virtualizing multiple applications and consolidating them on physical servers lowers costs, minimizes rack space, lowers power requirements, and simplifies deployment and management. Virtualization also accommodates redeploying hardware and scaling software applications as organizational needs change.

Cisco Business Edition 7000

The Cisco Business Edition (BE) 7000 serves organizations with 1,000 or more users, and it is the foundation of the Cisco

PA for Enterprise Collaboration. The Cisco BE7000 is built on a Cisco Unified Computing System (UCS) that ships readyfor-use with a preinstalled virtualization hypervisor and application installation files. The Cisco BE7000 solution offers premium voice, video, messaging, instant messaging and presence, and contact center features on a single, integrated platform. For more information about the Cisco BE7000, see the data sheet .

Core Applications

In the Cisco PA for Enterprise Collaboration, the following applications are deployed on multiple UCS servers to provide hardware and software redundancy:

Cisco Unified Communications Manager

Cisco Unified Communications Manager IM and Presence Service

Cisco Unity Connection

Cisco Expressway, consisting of Expressway-C and Expressway-E

Cisco TelePresence Conductor

Cisco TelePresence Server

Cisco TelePresence Management Suite and extensions

Cisco Prime Collaboration Deployment

Cisco Prime Licencing Manager

Cisco recommends always deploying redundant components and configurations to provide the highest availability for critical business applications.

High Availability

The Cisco PA for Enterprise Collaboration provides high availability for all deployed applications by means of the underlying clustering mechanism present in all Cisco Unified Communications applications.

Clustering replicates the administration and configuration of deployed applications to backup instances of those applications. If an instance of an application fails, Cisco Unified Communications services

—such as endpoint registration, call processing, messaging, business-to-business communication, and many others

—continue to operate on the remaining instance(s) of the application. This failover process is transparent to the users. In addition to clustering, the

Cisco PA for Enterprise Collaboration provides high availability through the use of redundant power supplies, network connectivity, and disk arrays.

Cisco Preferred Architecture for Enterprise Collaboration 10.x PAGE 8

Introduction

Sizing Considerations

Sizing a deployment can become complex for large enterprises with sophisticated requirements. The Preferred

Architecture for Enterprise Collaboration Cisco Validated Design (CVD) Guide presents some examples that simplify the sizing process. In addition, Cisco provides several tools to assist with sizing a deployment. The sizing tools are available to Cisco certified partners at http://tools.cisco.com/cucst . If you do not have access to the sizing tools, contact your Cisco account representative or Cisco certified partner to obtain system sizing information.

Licensing

Details about the individual licenses for the endpoints and infrastructure components in the Cisco Preferred Architecture for Enterprise Collaboration are beyond the scope of this document. Information about Cisco Unified Communications licensing is available on the License Administration Portal at https://tools.cisco.com/SWIFT/LicensingUI/Home . The

License Administration Portal also provides instructions and tools to assist with license administration.

Cisco Preferred Architecture for Enterprise Collaboration 10.x PAGE 9

Introduction

Cisco Integrated Services and Aggregation Services Routers

The Cisco Integrated Services Router (ISR) and Aggregation Services Router (ASR provide Wide Area Network (WAN) and Cisco Unified Communications services in a single platform. In the Cisco PA for Enterprise Collaboration, the Cisco

ISR and ASR can provide the following functions (Figure 2):

External connectivity to the Internet

IP routing and remote-site network services such as DHCP, DNS, NTP, and others

Cisco Unified Survivable Remote Site Telephony (SRST) to service calls during WAN failures

Voice gateway to the Public Switched Telephone Network (PSTN), or Cisco Unified Border Element (CUBE) for

Session Initiation Protocol (SIP) trunks

Integrated data and voice connectivity to service providers

Multiprotocol Label Switching (MPLS) WAN connectivity for an organization’s network

Media resources for Cisco Unified Communications Manager

Figure 2. Cisco ISR and ASR Functions

The Cisco ISR and ASR have additional slots that support add-on modules such as wireless controllers and VMware ESXi servers. Deployments can use various Cisco ISR and ASR models to support different features, to scale, and to accommodate additional services. Their modular design enables the Cisco ISR and ASR to be deployed at headquarters, remote locations, or branch locations. For more information about these routers, see the Cisco ISR and Cisco ASR data sheets.

Cisco Preferred Architecture for Enterprise Collaboration 10.x PAGE 10

Endpoints

Endpoints

Cisco Collaboration endpoints provide a wide range of features, functionality, and user experiences. Because Cisco endpoints range from low-cost, single-line phones and soft clients to three-screen Cisco TelePresence endpoints, an organization can deploy t he right variety of endpoints to meet users’ needs (Figure 3). Additionally, these devices enable users to access multiple communication services, such as:

Voice calls

Video calls

Conferencing

Voicemail

Presence

Instant messages

Desktop sharing

Figure 3. Architecture for Endpoints

Cisco Preferred Architecture for Enterprise Collaboration 10.x PAGE 11

Endpoints

Recommended Deployment

Cisco Unified CM is the call control server for the Cisco PA for Enterprise Collaboration. Cisco Unified IP Phones, Jabber clients, and TelePresence video endpoints use SIP to register directly to Cisco Unified CM.

The Unified CM cluster’s failover mechanism provides endpoint registration redundancy. If a WAN failure occurs and endpoints at remote locations cannot register to Unified CM, they use SRST functionality for local and PSTN calls, but some services such as voicemail and presence might not be available.

Cisco recommends the endpoints listed in the following tables because they provide optimal features for this design.

Cisco has a range of endpoints with various features and functionality that an organization can also use to address its business needs.

Table 2.

Cisco Unified IP Phones

Product

Cisco Unified IP Phone 7821

Cisco Unified IP Phone 8800 Series

Cisco Unified IP Phone 8831

Description

Public space, multi-line phone

General office use, multiple-line phone

IP conference phone

Table 3.

Cisco TelePresence and Video Endpoints

Product

Cisco EX Series

Cisco DX Series

Cisco MX Series

Cisco SX Series

Cisco IX Series

Description

Personal TelePresence endpoint for the desktop, with remote access

Personal TelePresence endpoint for the desktop

TelePresence multipurpose room endpoint

Integrator series TelePresence endpoint

Immersive TelePresence room system

Table 4.

Cisco Jabber

Product 1

Mobile:

Jabber for Android

Jabber for iPhone and iPad

Desktop:

Jabber for Mac

Jabber for Windows

Description

Soft client with integrated voice, video, voicemail, instant messaging, and presence functionality for mobile devices and personal computers

Table 5.

Comparison of Endpoint Features and Capabilities

Product(s)

IP Phone 7821

IP Phone 8800 Series

IP Phone 8831

EX Series

DX Series

MX Series

SX Series

IX Series

Jabber Mobile

Jabber Desktop

Audio

Y

Y

Y

Y

Y

Y

Y

Y

Y

Y

Video

N

N

N

Y

Y

Y

Y

Y

Y

Y

Content

Sharing

N

N

N

Y

Y

1

Y

Y

Y

N

Y

Unified CM High

Availability

Mobile and

Remote Access

Y

Y

Y

Y

Y

Y

Y

N

N

N

Y

N

Y

Y

Y

Y

Y

1. The Cisco DX70 and DX80 are the only DX Series endpoints that support content sharing

N

Y

Y

Cisco Preferred Architecture for Enterprise Collaboration 10.x

Audio

SRST

Y

Y

Y

N

N

N

N

N

N

Y

PAGE 12

Call Control

Call Control

Call control is the core element for any communications deployment. It provides endpoint registration, call processing, and call admission control. Call control design considerations include the enterprise dial plan, endpoint addressing scheme, calling party presentation, call admission control, codec selection, PSTN connectivity, and general trunking requirements, as well as other factors.

Cisco Unified CM provides a common call control platform for all Cisco Collaboration deployments (Figure 4). Having a highly available and common call control component for a communications infrastructure is crucial to provide consistent services for all devices and communication types and to preserve a uniform dial plan and a consistent feature set across the enterprise.

Adding the IM and Presence Service to a Cisco Unified CM deployment provides instant messaging, network-based presence, and federation for third-party chat servers, and it enables the use of Cisco Jabber for instant messaging, presence, and audio and video communications.

Figure 4. Architecture for Call Control

Table 6 lists the roles of the call control components in this architecture and the services they provide.

Table 6.

Components for Call Control

Module Component

Call Control

Cisco Unified Communications Manager

(Unified CM)

Cisco Unified Communications Manager IM and Presence Service

Cisco Integrated Services Router (ISR)

Description

Provides call routing and services, dial plan, and bandwidth management; and enables Cisco Jabber desk phone control

Provides Cisco Jabber support for instant messaging and user-based presence and third-party federation

Provides Survivable Remote Site Telephony (SRST) to support call control functions during a WAN outage

Cisco Preferred Architecture for Enterprise Collaboration 10.x PAGE 13

Call Control

Recommended Deployment

Deploy a single Cisco Unified CM cluster for an enterprise with a central site and remote offices. Deploy call processing subscribers in pairs for scalability and redundancy.

Add additional Cisco Unified CM clusters for very large sites or for geographic and/or organizational separation.

Configure SIP trunks to interconnect individual Cisco Unified CM clusters.

Deploy a pair of IM and Presence Service servers in a cluster configuration. Add more pairs for scalability.

Enable Cisco SRST on the Cisco ISR as a backup service at remote sites to provide high availability.

Benefits

This deployment provides the following benefits:

Call control is centralized at a single location that serves multiple remote sites.

Common telephony features are available across voice and video endpoints.

Single call control and a unified dial plan are provided for voice and video endpoints.

Critical business applications are highly available and redundant.

Deployment Best Practices

Cisco Unified Communications Manager and IM and Presence Service

Cluster Recommendations

Cisco Unified CM and IM and Presence support clustering, which is the grouping of nodes that work together as a single logical entity.

The publisher node contains the cluster’s configuration database, which is replicated to the call processing subscriber nodes and TFTP nodes in the cluster.

Clustering provides an automatic redundancy mechanism for endpoints and for Cisco Unified CM services, such as the ability to receive and process incoming calls (Figure 5). To provide 1:1 redundancy, always deploy call processing subscribers and TFTP nodes in pairs. Each Unified CM cluster must have at least one pair of call processing subscribers and a pair of TFTP nodes in addition to the publisher node, for a minimum of five Cisco Unified CM nodes in a cluster.

While the call processing subscribers provide endpoint registration and call processing capabilities, the pair of TFTP nodes provides configuration and firmware updates to endpoints.

All the TFTP nodes and subscriber nodes periodically receive updates of the configuration database from the dedicated publisher node. These database updates enable all the subscriber nodes to operate in a consistent configuration state.

To provide load balancing of call processing services across the subscribers and to reduce failover response times, deploy each call processing subscriber pair in an active/active redundancy scheme.

For IM and Presence, Cisco recommends deploying a minimum of one IM and Presence publisher and one subscriber.

The IM and Presence publisher is not a dedicated node, and the publisher and subscriber provide redundancy for each other.

Add more pairs of IM and Presence subscribers or Unified CM call processing nodes to accommodate more users.

Cisco Preferred Architecture for Enterprise Collaboration 10.x PAGE 14

Call Control

Figure 5. Cisco Unified CM Cluster

SIP Trunk Recommendations

Use SIP trunks from Cisco Unified CM to communicate with all the components in the Cisco PA for Enterprise

Collaboration, including external entities such as third-party systems. SIP trunks offer the following benefits:

SIP trunks provide a standards-based environment that reduces operations and maintenance complexity of the endto-end solution.

SIP trunks are enhanced with presence information.

SIP trunks are recommended for video communications.

Cisco Unified Survivable Remote Site Telephony

The Cisco Survivable Remote Site Telephony (SRST) feature is critical for remote sites that require continuation of voice services during WAN outages. SRST runs on the same Cisco ISR that provides WAN and PSTN connectivity for the remote site.

Deploy SRST on the Cisco ISR in the following cases:

The remote site has local PSTN connectivity.

The remote site does not have local PSTN connectivity but has more than 25 users.

To avoid interruption of external voice services if a WAN outage occurs, provide local PSTN connectivity at the remote site. SRST is required only if the remote site’s WAN reliability does not match that site’s required service level for voice service availability.

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Call Control

If a WAN failure occurs at a site with SRST and local PSTN access, the following services will be available:

Internal point-to-point voice calls

External voice calls through the PSTN

Call hold, transfer, and conference

Music on hold

Note: SRST is not available for Cisco MX or SX Series endpoints. See Table 5 for information about endpoints that support SRST.

Dial Plan

A structured, well-designed dial plan is essential to successful deployment of any call control system. When designing in a dial plan, consider the following main factors:

Dialing habits

Endpoint addressing

Routing

Directory integration

Classes of service

Dialing Habits

Dialing habits describe what end users can dial to reach various types of destinations. Dialing habits can first be classified as numeric dialing (for example, 914085550123) or alphanumeric dialing (for example, [email protected]).

Typically, different types of destinations require support for different dialing habits. For example:

PSTN toll call: 91-<10 digits>

PSTN international call: 9011-<country code + national significant number>

Abbreviated intra-site dialing: for example, 4XXX

Abbreviated inter-site dialing: for example, 8-<site code>-<intra-site number>

+dialing from directories: “+” followed by a fully qualified global PSTN number as described in ITU recommendation

E.164

URI dialing: for example, [email protected] for intra-company and inter-company dialing. Endpoints typically allow omission of the right-hand side (host portion) of the URI and they automatically append the local host portion, so that [email protected] can also be abbreviated as bob.

Further dialing habits might have to be defined for services such as call pick-up, voicemail, and others. Also, future growth should be considered so that more users and more sites can be added as needed without redesigning the dial plan.

Identifying dialing habits is most important when defining an enterprise dial plan in order to avoid overlaps between any two dialing habits. For example, a trunk access code of 9 prohibits abbreviated intra-site dialing starting with 9. Avoiding overlaps between dialing habits is crucial to avoid inter-digit timeouts, which lead to bad user experiences.

In migration scenarios, the dialing habits supported by the existing system can be used as a first estimate of the dialing habits required in the new system. On the other hand, migration to a new communications system can also serve as a reason to get rid of outdated customs and practices.

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Call Control

Endpoint Addressing

Each endpoint registered with the enterprise call control must have a unique numeric address. Endpoint addresses in

Cisco Unified CM are equivalent to the directory numbers provisioned on the lines of the endpoints. Use fully qualified

PSTN numbers (E.164 numbers) with a leading “+” as endpoint addresses. This format is typically referred to as +E.164 format. The benefits of using +E.164 endpoint addresses include:

Wide use in voice networks

No need to develop and maintain an enterprise numbering scheme

Easy creation of correct caller ID presentation for all on-cluster and off-cluster call flows

Easy implementation of directory lookups

Simplified alternate routing to the PSTN in cases of WAN failure or bandwidth constraints

For endpoints without assigned PSTN-based direct inward dial (DID) numbers (no E.164 number representation exists), create enterprise-wide unique endpoint addresses outside of the default +E.164 domain. These endpoint addresses should be in line with the internal dialing habit defined to reach these endpoints. If, for example, the abbreviated inter-site dialing habit to reach a set of non-DID endpoints in a given site is 84915XXX, then these non-DID endpoints should use this numbering scheme for their endpoint addresses.

In addition to the primary numeric endpoint addresses, administrators can provision alphanumeric URIs (for example, [email protected]) in Cisco Unified CM to serve as aliases for the primary addresses, and users can enter the URI as an alternate way to dial the destination endpoint.

Routing

The routing portion of the dial plan enables users to reach the correct destinations when they use the defined dialing habits.

The primary numeric routing is based on +E.164 numbers. External routes to other transport networks such as the PSTN also use the +E.164 scheme. Endpoint addresses in +E.164 provide +E.164 on-net dialing without any further configuration. All other numeric dialing habits, such as abbreviated inter-site and intra-site dialing, are implemented as overlays by adding the appropriate translation patterns to the dial plan to map from the implemented dialing habit to the

+E.164 global routing address format. This allows users to reach the same endpoint by means of different dialing habits, depending on user preference.

Alpha-numeric URIs, as aliases for numeric addresses, provide an alternative means of reaching endpoints. The benefits of URI dialing and routing include:

Conformity with the native dialing habit on most video systems

Easier business-to-business connectivity

Direct mapping from instant messaging identifiers to addresses (easier escalation of business-to-business IM sessions to voice and/or video), although technically IM identifiers and SIP URIs are not necessarily identical

If an endpoint is enabled for business-to-business calls over the Internet, Cisco recommends associating a SIP URI to the device so that the business-to-business routing logic can be based on SIP URIs.

As with numeric routing, if an alias or SIP URI is recognized as an internal destination and is associated with a specific device, then Cisco Unified CM sends the call to that device. However, if the dialed SIP URI does not match any registered endpoint alias, Cisco Unified CM uses SIP route patterns to determine where to send the call. For example, if the dialed alias [email protected] does not exist internally, Cisco Unified CM uses a SIP route pattern (such as *.com) to send the call to Expressway-C as a business-to-business call.

Cisco Preferred Architecture for Enterprise Collaboration 10.x PAGE 17

Call Control

Directory Integration

To enable users to search contacts and dial from the directory, integrate Cisco Unified CM with the organization’s LDAP directory. Although Cisco Unified CM allows the creation of local user contacts, LDAP directory integration is required when using Cisco Jabber because it provides a single location for directory management and enables users to authenticate to Cisco Unified CM and Cisco Jabber by using their LDAP directory credentials.

Cisco Unified CM pulls user and contact information from LDAP directories and synchronizes user parameters

—name, surname, username, telephone number, and SIP URI

—when changes occur. For example, use the telephoneNumber attribute to populate the Telephone Number field in the Cisco Unified CM directory. The format of phone numbers in the corporate directory must be globally significant and must match one of the defined dialing habits. Corporate directories typically should have all phone numbers in +E.164 format (leading “+” followed by the fully qualified global number) as long as a DID exists. Only this format allows the phone number in the corporate directory to be used universally inside and outside the enterprise. Non-DID numbers that are not in +E.164 format could be used to dial uses internally from the directory, but they would have no significance outside the enterprise. Use the mail attribute to populate the Directory URI field in the Cisco Unified CM directory if URI dialing is used.

The IM and Presence Service pulls user and contact information from Cisco Unified CM.

Class of Service

Classes of service define which users can access which services, such as allowing only emergency and local calls from lobby phones while allowing unrestricted calls from executive phones. The complexity of the dial plan is directly related to the number of differentiated classes of service it supports.

To define classes of service, configure partitions and calling search spaces in Cisco Unified CM. The number of classes of services supported by a dial plan depends on the granularity and complexity of the classes. For more information about classes of service and details on enterprise dial plan design, see the Cisco Collaboration SRND .

Multi-Cluster Deployment Considerations

Consider deploying more than one Cisco Unified CM cluster if you have any of the following requirements:

Administrational separation

This includes the need to keep users from different parts of the organization on separate infrastructures, or the requirement to have different departments operate different parts of the communications infrastructure.

Geographic footprint

Technical limitations such as excessive propagation delay might prohibit endpoint registrations (for example, endpoints in Asia registering to an enterprise call control hosted in the US).

In a multi-cluster deployment, interconnect all the individual Unified CM clusters through SIP trunks. To avoid session traversal through individual clusters, deploy a full mesh of SIP trunks. With four or more clusters, deploy Cisco Unified CM

Session Management Edition to centralize the dial plan and trunking and to avoid the complexity of a full-mesh SIP trunk topology.

In multi-cluster deployments, use Global Dial Plan Replication (GDPR) to replicate dial plan information between clusters.

GDPR can advertise a +E.164 number, one enterprise significant number (ESN), and up to five alpha-numeric URIs per directory number. An ESN is the abbreviated inter-site dialing equivalent of a directory number. The information advertised and learned through GDPR enables deterministic inter-cluster routing for these dialing habits:

+E.164 dialing based on the advertised +E.164 numbers

Enterprise abbreviated inter-site dialing based on the advertised ESNs

Alpha-numeric URI dialing based on the advertised URIs

Cisco Preferred Architecture for Enterprise Collaboration 10.x PAGE 18

Conferencing

Conferencing

The ability for three or more people to communicate in real time by using voice and video technologies is a core component of collaboration. Cisco rich media conferencing builds upon existing infrastructure in place for point-to-point calls, offering users a consistent voice and video experience (Figure 6).

Figure 6. Architecture for Conferencing

Table 7 lists the roles of the conferencing components in this architecture and the services they provide.

Table 7.

Components for Conferencing

Module Component

Conferencing

Cisco TelePresence Conductor

Cisco TelePresence Server

Cisco WebEx Software as a

Service (SaaS)

Cisco WebEx Meetings Server

Description

Manages and allocates conferencing resources

Optimizes resources by making unused resources available for greater scalability in conferencing

Provides voice and video conferencing

Available on dedicated hardware platforms and on virtual machines

Deployed with Cisco TelePresence Conductor

Subscription-based web conferencing delivered through WebEx Collaboration Cloud

On-premises web conferencing solution

Cisco Preferred Architecture for Enterprise Collaboration 10.x PAGE 19

Conferencing

There are three types of conferences:

Instant or ad hoc

— A conference that is not scheduled or organized in advance. For example, a call between two parties who add other parties to the call is an instant conference.

Permanent or rendezvous

— A conference that requires callers to dial a predetermined number or URI to reach a shared conferencing resource. Meet-me, static, and rendezvous are other names for this type of conference.

Scheduled

A conference planned in advance with a predetermined start time. Typically, conference resources are guaranteed to be available upon the start of the scheduled conference.

Recommended Deployment

Audio and Video Conferencing

Deploy Cisco TelePresence Servers in remotely managed mode for all conference types.

Deploy Cisco TelePresence Conductors in a cluster with TelePresence Servers as managed conference bridges.

Integrate the TelePresence Conductor cluster with Cisco Unified CM through SIP trunks and registered media resource conference bridges for instant conferences.

Integrate the TelePresence Conductor cluster with Unified CM through SIP trunks and route patterns for permanent and scheduled conferences.

Deploy Cisco TelePresence Management Suite to schedule conferences with TelePresence Conductors. Deploy

Cisco TelePresence Management Suite Provisioning Extension for provisioning of personal collaboration meeting rooms (CMRs).

Deploy Cisco WebEx Software as a Service for scheduled web conferences. If customers have special requirements that forbid storage of any data outside the company, Cisco WebEx Meetings Server can be deployed on-premises for scheduled web conferences.

Integrate Cisco WebEx conferencing with on-premises voice and video conferencing through the CMR Hybrid

(formerly, WebEx Enabled TelePresence) solution.

Benefits

This deployment provides the following benefits:

Users have a consistent experience for launching and joining various types of conferences.

A single conferencing platform provides on-premises audio and video conferencing.

CMR Hybrid allows users to connect to meetings either from their video and audio devices or through the WebEx cloud with a meeting client running on their desktop or mobile devices.

It provides users with real-time, high-definition video conferencing, including the ability to share content easily over a dedicated presentation channel.

Cisco Preferred Architecture for Enterprise Collaboration 10.x PAGE 20

Conferencing

Deployment Best Practices

Audio and Video Instant Conferences

For instant audio and video conferences, use on-premises TelePresence Servers managed by TelePresence Conductor as media resources. TelePresence Conductor conference templates are referenced by multiple virtual IP addresses.

These TelePresence Conductor virtual IP addresses register with Cisco Unified CM as instant conference bridges and are used in media resource group lists (MRGLs) and media resource groups (MRGs). Unified CM uses MRGLs and MRGs to prioritize and allocate media resources such as conference bridges, music on hold sources, annunciators, transcoders, and media termination points (MTPs).

If endpoints have access to the appropriate MRGL, they can request these resources. Resources local to the initiating endpoint are preferred over remote resources (Figure 7).

Figure 7. Media Resource Group List (MRGL) Example

A single TelePresence Conductor cluster can have multiple conference templates configured to provide a variety of service levels and experiences for instant audio and video conferences. With this architecture, administrators can segment their users and provide restrictions on instant conference size, media properties, and additional features such as content sharing.

Permanent Conferences with Cisco Collaboration Meeting Rooms (CMR) Premises

Permanent conferences are deployed using Cisco Collaboration Meeting Rooms (CMR) Premises. Cisco CMR Premises provides a permanent-type conference that is created with Cisco TMSPE in conjunction with the Conductor Provisioning

API that simplifies the deployment of on-premises audio and video conferencing. Administrators should use CMR

Premises to quickly configure and provision conferences, providing each user with their own personal conference space.

Users browse to a website with a simple interface and create their conference, specifying preferences such as welcome screen text, participant layout, and conference PIN protection.

Cisco TelePresence Management Suite Provisioning Extension (TMSPE) enables rapid provisioning of TelePresence users and their respective personal CMRs for large-scale deployments. TMSPE runs on the same Windows Server as the

TMS application.

Administrators must create a CMR template in TMS to specify the base dial plan for CMR URIs and numeric aliases.

When users create and personalize their CMRs, they receive instructions for how to dial in to their meetings, and these numbers and URIs are in line with the CMR template configured in TMS. As users create their CMRs, TMSPE provisions and configures the necessary settings on TelePresence Conductor, and no further interaction is needed from an administrator.

Cisco Preferred Architecture for Enterprise Collaboration 10.x PAGE 21

Conferencing

Scheduled Audio Conferences

Customers with audio-only phones can use Cisco WebEx Software as a Service (SaaS) or Cisco WebEx Meetings Server to host conferences. These solutions provide voice and video conferencing with content sharing capability on a single platform. Participants join the conferences using the meeting client running on their desktop or mobile device.

Cisco WebEx Software as a Service

Cisco WebEx SaaS is a subscription-based service delivered through the WebEx Collaboration Cloud, where all the meetings are hosted. Few components are deployed on-premises, so this option is well suited for customers who manage their communications budget as an operational expenditure.

WebEx Collaboration Cloud is highly available and has redundancy built into the infrastructure to handle component failure. Deploy Cisco WebEx SaaS using WebEx audio for web conferencing. Cisco highly recommends enabling HD video for the optimal video experience and enabling SSO to allow integration with the organization’s LDAP directory for access using common credentials.

For additional information on Cisco WebEx Software as a Service, see the product documentation .

Cisco WebEx Meetings Server

Cisco WebEx Meetings Server is a secure, fully virtualized WebEx conferencing solution with all of its equipment deployed on-premises behind the firewall. This option works well for customers that have strict requirements forbidding storage of any data outside the company.

Cisco WebEx Meetings Server builds on top of the Cisco Collaboration infrastructure and extends the implementation of

Cisco Unified CM to include conferencing. Connect Cisco WebEx Meetings Server and Cisco Unified CM by means of SIP trunks to provide services for attendees dialing into the system and for system callback to attendees to join the meetings.

Deploy Cisco WebEx Meetings Server with redundancy to provide system availability in the event of component failures.

With high availability, the system uses the N+1 redundancy scheme and runs in active/active mode. In addition, Cisco recommends enabling high-quality (HQ) video for the optimal video experience and integrating WebEx Meeting Server with the organization’s LDAP directory so that users can use the same credentials to access the meeting scheduler.

For additional information on Cisco WebEx Meetings Server, see the product documentation .

Scheduled Video Conferences

For scheduled video conferences, use the same Cisco TelePresence Conductor for non-scheduled conferences with remotely managed Cisco TelePresence Servers as the conferencing resource. The TelePresence Server resource can be shared between both scheduled and non-scheduled conferences, or a second Multiparty Media 400v TelePresence

Server can be dedicated only for scheduled conferences (Figure 8). Integrate the TelePresence Conductor to Cisco

Unified CM with SIP trunks, and manage it through Cisco TMS.

Cisco Preferred Architecture for Enterprise Collaboration 10.x PAGE 22

Figure 8. Architecture for Video Conferencing

Conferencing

Cisco Preferred Architecture for Enterprise Collaboration 10.x PAGE 23

Conferencing

Cisco Collaboration Meeting Rooms (CMR) Hybrid

Cisco CMR Hybrid combines the on-premises video conference and the WebEx cloud-based conference into a single meeting. Participants can join the scheduled meeting using the WebEx meeting client or a TelePresence device, and they experience two-way video, audio, and content sharing from their respective devices. As illustrated in Figure 9, Cisco recommends deploying Cisco Expressway-C and Expressway-E to handle calls to and from the WebEx cloud, and Cisco

Expressway Rich Media Session Licenses are required. Deploy a Cisco TelePresence Conductor with remotely managed

Cisco TelePresence Server as the TelePresence conference resource. Configure all TelePresence devices to register to

Unified CM.

As with other components in this architecture, deploy Cisco Unified CM, Cisco TelePresence Conductor, and Cisco

Expressway in cluster configurations to provide redundancy in case of a failure event.

Note: Currently, CMR Hybrid does not support Cisco WebEx Meetings Server.

Figure 9. Architecture for Cisco CMR Hybrid

Cisco Collaboration Meeting Rooms (CMR) Cloud

Cisco CMR Cloud is an alternate conferencing deployment model that negates the need for any on-premises conferencing resource or management infrastructure. CMR Cloud is a simple-to-use cloud hosted meeting room solution that is offered as an add-on option to a Cisco WebEx Meeting Center subscription, and is delivered through the Cisco

WebEx Cloud. CMR Cloud negates the need for on-premises conferencing resources but still requires deployment of local call control. The solution enables meetings in the cloud that can scale to support up to 25 standards-based video endpoints and up to 500 video-enabled and 500 audio-only WebEx Meeting Center users in a single meeting. Participants can join CMR Cloud conferences from Cisco endpoints, third-party standards-based endpoints and unified communications clients, soft clients such as Cisco Jabber, and Cisco WebEx clients running on mobile or desktop devices. CMR Cloud is recommended as an alternative to on-premises conferencing equipment for customers interested in keeping capital expenses low, or those who already utilize Cisco WebEx Meeting Center and are looking to expand their video capabilities.

Cisco Preferred Architecture for Enterprise Collaboration 10.x PAGE 24

Conferencing

Support for Multiple Call Processing Sites

Organizations may choose to implement more than one Cisco TelePresence Conductor cluster for any of the following reasons:

Administrational separation

— This includes the need to keep users from different parts of the organization on separate infrastructures or to have different departments operate different parts of the communications infrastructure.

Geographic footprint

— Physical limitations such as excessive latency between endpoints and conferencing resources could degrade the user experience (for example, US users might not have a productive collaborative meeting if they use conferencing resources located in Europe).

Multiple Unified CM clusters

— If more than one Unified CM cluster is already deployed due to the previous reasons, Cisco recommends also deploying multiple TelePresence Conductor clusters.

Deploy multiple TelePresence Conductor clusters along with local TelePresence Server resources (Figure 10). Implement a global dial plan, as discussed in the Call Control section, to enable users to access conferences regardless of where the

TelePresence Conductor or TelePresence Server is located.

Figure 10. Multiple Call Processing Sites with Conferencing

Cisco Preferred Architecture for Enterprise Collaboration 10.x PAGE 25

Collaboration Edge

Collaboration Edge

Business demand for connectivity between organizations by leveraging the Internet has increased significantly over the past few years. For many organizations, this connectivity is a fundamental requirement for conducting day-to-day activities. Moreover, securely connecting mobile workers and remote sites to each other and to headquarters is critical functionality that enables organizations to accomplish their business goals. The Cisco PA for Enterprise Collaboration addresses these needs with the Collaboration Edge architecture shown in Figure 11.

Figure 11. Architecture for Collaboration Edge

Table 8 lists the roles of the Collaboration Edge components in this architecture and the services they provide.

Table 8.

Components for Collaboration Edge

Module

Collaboration Edge

Component

Cisco Expressway-E

Description

The traversal server that enables secure VPN-less mobile and remote access for

TelePresence endpoints and Jabber clients. The traversal server resides in the

DMZ. The solution also provides business-to-business calling, protocol interworking, and cloud connectivity.

Cisco Expressway-C The traversal client that creates a secure, trusted connection through the firewall to Expressway-E. The traversal client resides inside the enterprise network. The solution provides mobile and remote access, business-to-business calling, protocol interworking, and cloud connectivity.

Enables local PSTN connectivity Cisco ISR or ASR with PSTN

Interfaces

Cisco ISR or ASR with Cisco

Unified Border Element (CUBE) software

Enables connectivity from an organization’s network to the service provider network for SIP trunks via CUBE

Cisco Telepresence ISDN Gateway Enables local PSTN connectivity up to [email protected]

Cisco Preferred Architecture for Enterprise Collaboration 10.x PAGE 26

Collaboration Edge

Recommended Deployment

Headquarters

Deploy a Cisco Expressway-C and Expressway-E server pair to enable remote Jabber and TelePresence video endpoint registrations, and IM and Presence. Deploy a separate Expressway-C and Expressway-E server pair for secure business-to-business connectivity through the firewall. Cluster both Expressway-C and Expressway-E servers in both pairs.

Deploy Cisco ISR or ASR as the PSTN gateway, or enable CUBE functionality on the Cisco ISR or ASR for voice connectivity from the organization’s network to the service provider network through a SIP trunk.

Deploy video gateways if ISDN interoperability is needed.

If full redundancy is not required, a single server pair (Expressway-C and Expressway-E) may be deployed.

Remote Sites

Deploy Cisco ISR as the PSTN gateway.

Deploy Expressway-C and Expressway-E if the remote site has local Internet connectivity and an Internet businessto-business architecture for video calls is required.

Teleworker Sites

For video-enabled sites, deploy Cisco TelePresence endpoints utilizing the Expressway-C and Expressway-E infrastructure at headquarters or another site.

In addition, the Cisco Jabber client can be used without the VPN, regardless of the location of the endpoint (internal or external to the organization).

Legacy audio and video-enabled phones can be deployed with VPN technologies. Depending on the phone type, some of them have an embedded VPN client and may be deployed without a VPN hardware client. For more information on each phone model, refer to the product documentation .

Benefits

This deployment provides the following benefits:

The Cisco ISR supports standards-based interfaces and various PSTN types, so it can be deployed globally.

Instead of traditional PSTN interfaces, CUBE functionality can be enabled on the Cisco ISR and ASR if a SIP trunk is used.

The Cisco ISR and ASR can be used for WAN connectivity.

Cisco Expressway provides calling, presence, instant messaging, voicemail, and corporate directory services for

Cisco Jabber and TelePresence video endpoints.

Cisco Expressway enables video communications between organizations, partners, and vendors over the Internet.

Deployment Best Practices

Cisco Expressway

Cisco Expressway provides secure firewall and NAT traversal for mobile Cisco Jabber and TelePresence video endpoints

(Figure 12) and secure business-to-business communications (Figure 13). Cisco Expressway consists of two applications:

Expressway-C and Expressway-E.

Deploy Cisco Expressway-C inside the network, and deploy Expressway-E in the demilitarized zone (DMZ) by connecting separate network ports on Expressway-

E to the organization’s network and to the DMZ.

Cisco fully supports a virtualized Expressway-E in the DMZ; however, a dedicated server can be deployed based on the company’s security requirements.

Cisco Preferred Architecture for Enterprise Collaboration 10.x PAGE 27

Figure 12. Traversal for Registrations Through Firewall with Expressway-C and Expressway-E

Collaboration Edge

Figure 13. Traversal for Business-to-Business Calls Through Firewall with Expressway-C and Expressway-E

Cisco Expressway-C

Place Expressway-C in the trusted network inside the organization. Deploy Expressway-C to:

Function as a traversal client and establish a secure connection to Expressway-E through the firewall

Establish secure or non-secure connection to Cisco Unified CM

Integrate with an existing internal video network that uses H.323

Enable business-to-business calls to external entities that communicate using SIP or H.323

Provide interworking between H.323 and SIP protocols for H.323 business-to-business communications

Enable mobile and remote access capabilities and call signaling for Cisco-supported endpoints, directing them to

Cisco Unified CM for SIP registration and/or the IM and Presence Service (See the Endpoints section for information on which endpoints support mobile and remote access.)

Cisco Preferred Architecture for Enterprise Collaboration 10.x PAGE 28

Collaboration Edge

Cisco Expressway-E

Because Expressway-E is reachable directly from the untrusted, external network, it should be placed in a DMZ for security.

The organization’s firewall policies control communications to and from this server. Deploy Expressway-E to:

Function as a traversal server and allow secure communications to and from Expressway-C

Enable audio and video connections to other organizations using SIP or H.323 on the Internet

Provide secure communications to cloud-based services, such as CMR Hybrid services, to the WebEx cloud

Provide DNS SRV lookup service to resolve outbound calls and to receive inbound calls over the Internet

Process registration and IM and presence information from Cisco endpoints on the external network and use secure traversal communications to pass the information to Expressway-C

Provide interworking between protocols (between SIP and H.323, and between IPv4 and IPv6) for business-tobusiness communications

Connectivity for Audio and Video over the Internet

URI dialing is the best practice for audio and video dialing over the Internet. Cisco recommends assigning alphanumeric

URIs to all devices that will send or receive calls over the Internet. Any device on Cisco Unified CM can be reached over the Internet by dialing the assigned alphanumeric SIP URI or the required directory number (DN) by dialing <+E.164

number>@domain. For example, a Jabber user might have a SIP URI set to [email protected] and a phone number set to +14085551234. If someone dials [email protected] or [email protected] from an external location on the

Internet, Alice would receive the call on the Jabber client and all devices that share the same number.

Users on Cisco Unified CM have to dial the full SIP URI to reach a user or device from a different organization over the Internet.

The architecture for business-to-business Internet connectivity includes a client/server solution: Expressway-C and

Expressway-E. Both servers can be deployed in standalone mode or in a cluster. Deploy the same number of cluster peers for Expressway-C clusters as for Expressway-E clusters.

Cisco recommends deploying dedicated Expressway-C and Expressway-E clusters per customer-chosen Internet breakout to minimize having outbound business-to-business calls traverse the WAN by routing them, instead, to an

Internet breakout close to the client that initiated the call. This minimizes the business-to-business call-related utilization of the enterprise WAN.

Considerations for Outbound Business-to-Business Calls

When multiple Expressway-C and Expressway-E pairs are deployed, Unified CM can redirect an outbound call to the edge server that is nearest to the calling endpoint, thus minimizing WAN traffic.

For call routing over the Internet, use public DNS service records. DNS SRV records map a domain to an edge system servicing that domain for that protocol. For example, if a remote user dials [email protected], then the remote system uses DNS to query for the host offering the SIP service for the domain ent-pa.com.

If the remote endpoint supports IP dialing only, Cisco Unified CM users can dial the IP address of the endpoint followed by a string, which will be used to route the call. As an example, the user can dial [email protected] instead of dialing 10.10.10.10. The string “@ip” will be used by Cisco Unified CM to route the call to the Expressway-C.

Expressway will send it to the Expressway-E, which will place the call to the IP address specified.

Cisco Preferred Architecture for Enterprise Collaboration 10.x PAGE 29

Collaboration Edge

Considerations for Inbound Calls

Once a call reaches an Expressway-E, it is routed to the relevant Unified CM cluster through its corresponding

Expressway-C. In deployments with multiple edges (multiple pairs of Expressway-C and Expressway-E), there are two methods to route inbound calls:

Call routing based on the calling location

In this scenario, a business-to-business call enters the corporate network through the edge that is nearest to the calling endpoint or user. Because the call enters the corporate network after traversing a minimal distance over the

Internet, this approach focuses on using the shortest path to the point of entry as the means of providing the best quality experience. In this scenario, use Geo-DNS. Geo-DNS provides unique DNS responses by geographic regions based on the source IP address of the DNS query, and it is thus able to direct a SRV query to the specific edge servicing a particular region. In this way, the calling endpoint is typically directed to the edge nearest to its calling location.

Call routing based on the called location

It is possible to direct the inbound call to the edge that is nearest to the called endpoint. This approach has the benefit of reducing the video bandwidth consumed over the WAN, but it requires a more complex architecture that has some scaling constraints. For this reason, Cisco does not recommend implementing this architecture when more than two edges are deployed.

Note: Call routing based on the called location applies to room and personal systems or clients that are not moving across sites.

In addition, the Cisco Collaboration Architecture enables IP based dialing for those endpoints on the Internet that are capable to dial IP addresses only. The Expressway-E external interface IP address can be dialed from the Internet, and the call can be sent to a multipoint device or to a Cisco Unity Connection system, which will prompt the calling user to specify the destination. Once the destination is entered, the call will be sent to the specified destination.

Mobile and Remote Access

The mobile and remote access feature enables Jabber clients and Cisco EX, SX, C, and MX Series endpoints to register securely to Cisco Unified CM through Expressway-E and Expressway-C without any VPN. A Jabber client can send and receive several types of collaboration flows (audio, video, instant messaging, and presence), while a hardware endpoint can send audio and video streams. When multiple edges are deployed, Cisco recommends using Geo-DNS services to provide the best network option based on assigning the closest edge in the DNS response.

The mobile and remote access functionality also leverages Expressway-C and Expressway-E. Both business-to-business and mobile and remote access services are supported on the same server, but Cisco recommends deploying these services on different Expressway-C and Expressway-E pairs in order to scale.

Instant Messaging and Presence Federation

Instant messaging and presence federation involves allowing users to send XMPP traffic through an organization’s external firewall for chat and presence status information to and from users in another organization.

Prior Cisco architectures involved using the Cisco ASA firewall as a TLS proxy and allowing inbound ports to be opened through the external firewall to directly access the IM and Presence servers internally.

Expressway-C and Expressway-E are now the preferred architecture for external IM and Presence federation.

PSTN Gateway

Because landlines and mobile phones use the PSTN for local and international calls, external connectivity to the PSTN from an organization’s IP telephony network is a requirement (Figure 14).

Cisco Preferred Architecture for Enterprise Collaboration 10.x PAGE 30

Collaboration Edge

Figure 14. PSTN Connectivity

Use Cisco ISR or ASR with a time-division multiplexing (TDM) module as the PSTN gateway at headquarters. This configuration enables the gateway to implement media interworking for the organization’s incoming and outgoing PSTN calls.

At remote sites, deploy a Cisco ISR for local PSTN connectivity using voice modules. For more information about Cisco

ISR, see the data sheet .

If SIP trunks are used to connect to a service provider for voice calls, enable CUBE functionality on the Cisco ISR that is deployed at headquarters. When deploying Cisco ISR with CUBE functionality, observe the following recommendations:

Deploy CUBE in the demilitarized zone (DMZ).

Enable the firewall for NAT to convert the external address to the address of CUBE.

Enable the firewall to inspect voice calls.

Cisco Unified CM routes calls through SIP trunks to gateways, CUBE, or Cisco Expressway based on the dial plan. For dial plan recommendations, see the Dial Plan section.

PSTN Connectivity for Voice

Enable PSTN connectivity for voice calls by using either an analog or ISDN interface. A Cisco ISR or ASR with analog or

ISDN cards provides these interfaces. Connectivity is usually local, and a site with PSTN interfaces uses its local ISR or

ASR as a voice gateway. Follow these recommendations for deploying an ISR or ASR for PSTN connectivity:

PSTN interface (analog or ISDN)

The device providing these interfaces is a Cisco ISR or ASR with analog or ISDN cards.

Connectivity is usually local; a site with PSTN interfaces uses its local ISR or ASR as a voice gateway.

Redundancy is achieved by deploying multiple ISRs or ASRs. Cisco Unified CM has the ability to route traffic to the closest available router.

SIP trunks to the service provider and ISR, ASR, or CUBE as a border element

This deployment is typically used in a centralized architecture. Remote sites either do not have local connectivity, or they have local connectivity but use it only for backup voice services. In this case the WAN connectivity has to be sized to accommodate PSTN calls traversing the WAN to the central site where CUBE is deployed.

Redundancy can be achieved by deploying multiple ISRs or ASRs, sometimes to different voice carriers. Cisco

Unified CM has the ability to route traffic to the closest available router.

ISDN Connectivity for Video

Although many organizations now use the Internet for business-to-business video connectivity, legacy interoperability with

ISDN networks might still be required if the called party is not reachable through the Internet. To provide ISDN connectivity for video, use the following Cisco TelePresence ISDN gateways:

Standalone unit

– Cisco TelePresence ISDN GW 3241

Chassis mounted unit

– Cisco TelePresence ISDN GW MSE 8321

Cisco Preferred Architecture for Enterprise Collaboration 10.x PAGE 31

Applications

Applications

While many additional applications from Cisco and our Ecosystem partners are available, this chapter focuses on a subset of core applications that are necessary for most collaboration environments. In addition to the call processing and media resource components, the Cisco PA for Enterprise Collaboration includes the following Cisco core applications that are considered to be a basic requirement and “foundational” to an Enterprise Collaboration solution (Figure 15):

Cisco Unity Connection

— Provides unified messaging

Cisco TelePresence Management Suite

— Provides conference scheduling and Collaboration Meeting Room

(CMR) administration

Figure 15. Architecture for Applications

Table 9 lists the roles of the application components in this architecture and the services they provide.

Table 9.

Components for Applications

Module

Applications

Tools

Component

Cisco Unity Connection

Cisco TelePresence Management

Suite and extensions

Cisco Prime Collaboration

Deployment

Cisco Prime License Manager

Description

Provides unified messaging and voicemail services

Provides scheduling, web conferencing integration, and other advanced video features

Assists the administrator by automating many of the steps necessary to install a Unified CM cluster with IM and Presence Service

Is integrated into Cisco Unified CM as a tool to provide the administrator with a single management point for the various licenses used in a deployment

Cisco Preferred Architecture for Enterprise Collaboration 10.x PAGE 32

Applications

Cisco Unity Connection

Cisco Unity Connection enables users to access and manage voice messages in a variety of ways, such as by email inbox, web browser, Cisco Jabber, Cisco Unified IP Phone, TelePresence, smartphone, tablet, and many more. Users can interact with Unity Connection either through phone keypad keys or through voice commands that they speak into the phone handset, headset, or speakerphone.

Recommended Deployment

Deploy two Unity Connection servers for each Cisco Unified CM cluster to provide high availability and redundancy.

Use SIP trunks to integrate Unity Connection with Unified CM. Configure two SIP trunks, one for each Unity

Connection server in a pair.

Enable the speech-activated voice command interface to maximize productivity of mobile workers.

Benefits

Users can access the voicemail system and retrieve their voice messages by using their IP phones, mobile devices, and various email client applications with either a dialed number or a SIP URI.

Cisco Unity Connection allows users to customize personal settings from a web browser.

Cisco Unity Connection offers a natural and robust speech-activated user interface that allows users to browse and manage voice messages using simple and natural speech command.

Deployment Best Practices

Cisco Unity Connection supports a cluster configuration in active/active mode to provide both high availability and redundancy. A Unity Connection cluster consists of a maximum of two nodes, one publisher and one subscriber in an active/active deployment (Figure 16). If one of the Unity Connection nodes fails, the other active node in the cluster handles all the calls, IMAP requests, and HTTP requests for the Unity Connection cluster. Each server in the Unity

Connection cluster must have enough voice messaging ports to handle all calls for the cluster.

Figure 16. Unified Messaging Architecture

Single Inbox, one of the unified messaging features in Cisco Unity Connection, synchronizes voice messages in Unity

Connection and Microsoft Exchange mailboxes. Unity Connection supports the Single Inbox feature with on-premises

Microsoft Exchange, cloud-based Microsoft Exchange, or Microsoft Office 365 server, thereby providing unified messaging for voicemail. All voice messages, including those sent from Cisco Unity Connection ViewMail for Microsoft

Outlook, are first stored in Cisco Unity Connection and are immediately replicated to the Microsoft Exchange mailbox of the recipient. This feature can be configured for each individual user separately.

Unity Connection imports the user information from the enterprise LDAP directory.

Cisco Preferred Architecture for Enterprise Collaboration 10.x PAGE 33

Applications

Each mailbox must have a unique voicemail number. Unity Connection supports both E.164 and + E.164 formats for the extension of an end-user account (user with a voice mailbox). Unity Connection also supports alternate extensions per user.

The voicemail pilot number designates the directory number that users dial to access their voice messages. Unified CM automatically dials the voice messaging number when users press the Messages button on their phone. The voicemail pilot number can be an internal extension or a dedicated PSTN number.

Visual Voicemail allows user to access voicemail using the graphical interface on the IP phone. Users can view a list of messages and play messages from the list. Users can also compose, reply to, forward, and delete messages. Each voicemail message displays data including the date and time when the message was left, urgency level, and message length.

For more information on Cisco Unity Connection, refer to the product documentation .

Cisco TelePresence Management Suite and Extensions

Cisco TelePresence Management Suite (TMS) runs on a Microsoft Windows server instance and provides the scheduling and video call initiation functions for the enterprise. User profiles are imported from Microsoft Active Directory, and the permissions model allows for access control to the various components and configured systems. The TMS application also provides users with enhanced features such as directories and one button to push (OBTP) on controlled endpoints.

TMS utilizes a Microsoft SQL database for all information about users, controlled devices, and scheduled conferences. In addition to the core TMS application, the following two additional software extension applications provide supplemental features and services to enhance the overall video communications experience:

Cisco TelePresence Management Suite Provisioning Extension (TMSPE)

TMSPE creates collaboration meeting rooms (CMRs) for users according to the permissions and feature limits defined by the administrator. In addition to CMR functionality, TMSPE also engages other scheduling options, besides the administrator booking page, within the TMS application. One of these options includes the ability to schedule WebEx Enabled TelePresence, bringing WebEx functionality and scale to meetings.

Cisco TelePresence Management Suite Extension for Microsoft Exchange (TMSXE)

TMSXE allows end users to schedule meetings using their Microsoft Outlook clients and to include the room system video resources by selecting the room as a resource.

Recommended Deployment

A single deployment of TMS is required for each organization. Leverage the integrated system navigator folder structure to organize all endpoints and infrastructure devices. Even multinational and global organizations can benefit from a single deployment of TMS for facilitating video connections.

Redundancy Model for TMS

Redundancy for TMS and its supporting extensions is different from other components in the Cisco PA for Enterprise

Collaboration. TMS and its components operate in an active/passive model instead of clustering. A single instance of TMS consists of a Network Load Balancer, two servers hosting TMS and TMSPE applications, two servers hosting the TMSXE application, and the SQL database (Figure 17). The licensing for the instance is maintained in the SQL database, so separate licensing is not required for each node. Only one server for each application is active at any moment, with the web pages and services of the passive (inactive) node locked down to refuse all other incoming traffic. All servers must be members of the same domain.

Cisco Preferred Architecture for Enterprise Collaboration 10.x PAGE 34

Applications

Figure 17. TMS Redundancy Model

Deploy the Microsoft SQL database separately from the TMS server. The instance of SQL may be shared by other applications within the organization, and it should be a highavailability deployment in accordance with Microsoft’s recommendations.

Benefits

Cisco TMS and Extensions provide the following benefits:

A properly configured and deployed TMS instance with the software extensions provides end users with a userfriendly and feature-rich experience.

Users can schedule conferences for video, audio, and Web participants through a single unified interface.

In addition, participants can launch the conference session with one button to push (OBTP) on supported endpoint devices.

Even multinational and global organizations can benefit from a single instance of TMS for facilitating video connections.

Tools for Application Deployment

In addition to the core applications described in this chapter, there are two useful tools to help administrators deploy the

Enterprise Collaboration Preferred Architecture:

Cisco Prime Collaboration Deployment

— Assists the administrator by automating many of the steps necessary to install a Unified CM cluster with IM and Presence Service.

Cisco Prime License Manager

— Is integrated into Cisco Unified CM as a tool to provide the administrator with a single management point for the various licenses used in a deployment.

Cisco Preferred Architecture for Enterprise Collaboration 10.x PAGE 35

Appendix

Appendix

Product List

This product list identifies the Cisco products in the Preferred Architecture for Enterprise Collaboration, along with their recommended software versions.

Product

Cisco Unified Communications Manager and IM and Presence Service

Cisco Unity Connection

Product Description

Call control, instant messaging, and presence services

Voicemail services

Cisco Expressway-C and Expressway-E Mobile and remote access and business-to-business communications

Cisco Prime License Manager

Cisco Prime Collaboration Deployment

Cisco TelePresence Conductor

Cisco TelePresence Server

Cisco ISR G2

Cisco Unified IP Phone 7800 Series

Cisco Unified IP Phone 8800 Series

Cisco Unified IP Phone 8831

Cisco Jabber

1

Cisco DX Series

Cisco EX Series

Cisco TelePresence MX Series

Cisco TelePresence SX Series

Soft client with integrated voice, video, voicemail, and instant messaging and presence functionality for mobile devices and personal computers

Personal TelePresence endpoint for the desktop

Personal TelePresence endpoint for the desktop

TelePresence multipurpose room endpoint

Integrator Series TelePresence endpoint

Recommended Software Version

10.5(2)

10.5(2)

X8.5

10.2(3)

TC7.3

TC7.3

TC7.3

Single management point for licensing

Installs Unified CM cluster with IM and Presence Service

Video conferencing resource management

Audio and video conferencing resources

10.5(2)

10.5(2)

XC3.0

4.1

PSTN gateway, SRST, and external connectivity to the Internet IOS 15.4(3)M1

General office use, multi-line phone

General office use

IP conference phone

10.2(1)SR1

10.2.2

9.3(4)

Jabber 10.6

Cisco TelePresence Management Suite

(TMS)

Scheduling, web conferencing integration, and other advanced video features

14.6

1. The minimum Cisco Jabber version required to support Cisco Expressway mobile and remote access capabilities is 9.6 or 9.7, depending on platform.

Consult the Jabber product release notes for specific minimum version support.

Cisco Preferred Architecture for Enterprise Collaboration 10.x PAGE 36

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