Hosted PBX Description
Hosted PBX Description
General Info about Hosted PBX
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Product Information
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VoIP Logic LLC, 529 Main Street, Williamstown, MA 01267 USA +1-310-279-4700
Hosted PBX Product Definition
A Hosted PBX platform delivers PBX functionality as a service, available over the
Public Switched Telephone Network (PSTN), dedicated IP circuit, or the public
Internet. A Hosted PBX is typically provided by telephone, cable, and wireless
service providers, using equipment located at a ‘core’ centralized or geographically
redundant data centers. The enterprise customer organization or the Service
Provider does not need to buy or install telephone equipment on the office site
other than telephone handsets and/or handset aggregator devices. The Service
Provider can use the same core switching equipment to service multiple enterprises
spread-out over a large geographic area.
Instead of buying PBX equipment, Enterprises and End users contract for PBX
services from the hosted PBX Service Provider – often leasing telephone handsets
as part of an overall service package.
Hosted PBX offerings deliver traditional Class 5 switch features and services, in
addition to more advanced services. A more detailed description of the features and
services available using the VoIP Logic Platform-as-a-Service (PaaS) can be
requested from your sales representative.
Below are some of the high level benefits of a Hosted PBX platform as a means of
providing enterprise telephone/communications services.
Supports a partially or totally dispersed work force.
Allows a single number to be presented for the entire company, despite its
being geographically distributed. A company could even choose to have no
premises, with workers connected from home using their domestic
telephones but receiving the same features as any PBX user.
Supports many different device types even within the same organization.
This allows users to utilize the device which best suits their needs and allows
for greater efficiencies.
Allows multimodal access, where employees access the network via a
variety of telecommunications systems, including POTS, ISDN, cellular
phones, and VOIP. This allows one extension to ring in multiple locations
(either concurrently or sequentially).
Supports integration with custom toll plans (that allow intra company calls,
even from private premises, to be dialed at a cheaper rate) and integrated
billing and accounting (where calls made on a private line but on the
company's behalf are billed centrally to the company).
Eliminates the need for companies to manage or pay for on-site hardware
Supports integration with a large range of add-on communications
technology like Instant Messenger (IM), Audio and Video Conferencing, Call
Center systems and Call Recording.
© Copyright 2013 VoIP Logic - Proprietary and confidential
Key Components of VoIP Logic’s Hosted PBX Platform
Application Server
The BroadWorks application servicer provides an extensive list of standard PBX
functions as well as some enhanced services including call centers, conferencing,
SIP Trunking, Unified Messaging, voice, video, and fax mail, as well as the ability to
integrate other devices notably mobile phones, tablets or other devices. All setup
and configuration can be managed through a native Web portal and a range of
client software or through third party software purpose built to streamline
interaction with BroadSoft technology including Loki for provisioning and end user
self-care, Akixi ACD management for call center wall-boarding, Microsoft Lync for
desktop client integration, CTI and Orecx for call recording and a wide range of
billing and reporting solutions. The core application server allows Service Providers
to target businesses with as few as five end users or large enterprises with
thousands of users distributed across the globe. With its powerful feature
capabilities, its geographic redundancy failover capabilities and the unsurpassed
scalability of the application technology, BroadWorks Hosted PBX empowers Service
Provider to manage and grow their telephony business on a reliable foundation.
Session Border Controller
A session border controller (SBC) is a multi-purpose device used in VoIP networks
to exert control over the signaling and, usually, also the media streams involved in
setting up, conducting, and tearing down telephone calls or other interactive media
SBCs reside between two service provider networks in a peering environment, or
between an access network (public IP, MPLS, private IP, private circuits, etc.) and a
backbone network to provide service to enterprises and other end users.
VoIP Logic employs Genband’s Quantix-series SBCs as part of its platform for VoIP
Peering and routing which allows Service Providers, by partitioned control, to
provision, route and manage call information in a self-sufficient manner.
VoIP Logic employs Oracle Communications’ Acme Packet Net-Net SBCs as part of
its platform for access network control.
In aggregate, these devices maintain full session state and offer the following
Security – protect the network and other devices from attacks such as denial
of service.
Connectivity – allow different parts of the network to communicate by, for
example, supporting NAT traversal.
Quality of service – the QoS policy of a network and prioritization of flows is
often implemented by the SBC.
Regulatory – many times the SBC is expected to provide support for
regulatory requirements such as emergency calls and lawful interception.
Statistics – since all sessions that pass through the edge of the network pass
through the SBC, it is a natural point to gather statistics and information on
these sessions.
© Copyright 2013 VoIP Logic - Proprietary and confidential
Media Gateway
A media gateway is a translation device or service that converts digital media
streams between disparate telecommunications networks such as PSTN, SS7, Next
Generation Networks (2G, 2.5G and 3G radio access networks), VoIP and PBXs.
Media gateways enable multimedia communications across Next Generation
Networks over multiple transport protocols such as Asynchronous Transfer Mode
(ATM) and Internet Protocol (IP). Media streaming functions such as echo
cancellation and DTMF are also located in the media gateway.
Depending on the specific requirements of the Service Providers offering, media
gateways can play a vital role converting legacy technology to make it compatible
with VoIP. Increasingly, SBCs and other devices have on-board media gateway
capabilities. Where a standalone media gateway resource is required, VoIP Logic
employs Cisco technology.
Modern media gateways used with Session Initiated Protocol (SIP) are often standalone units with their own call and signaling control integrated and can function as
independent, intelligent SIP end-points. These devices are often miniaturized and
placed at the enterprise customer site as an aggregator device.
In essence, VoIP media gateways perform the conversion between TDM voice to a
media streaming protocol associated with packetized voice (usually Real-time
Transport Protocol, RTP), as well as a signaling protocol used in the VoIP system.
Integrated Access Devices (IADs) and other Edge Access Equipment
Edge Access Devices combine multiple voice and data features, network firewall,
and SIP Application Level Gateway (ALG) into a single network services gateway.
Typical models may have up to 4 T1 WAN interfaces or a single Ethernet WAN, a 4
port managed VLAN switch, a call quality (QoS) probe and a Wireless Access Point.
Some models may also include integrated analog phone and line ports.
The majority of all SIP-capable firewalls today use the SIP Application Level
Gateway (ALG) architecture, which solves firewall traversal by “taking care of the
SIP packets on-the-fly,” making sure that they reach the right destination on the
LAN. It does not provide the full protection and flexible functionality necessary for
today’s secure enterprise.
benefits of an edge access device with SIP ALG include:
Far-end-NAT traversal (FENT) to support remote users;
Encrypted SIP signaling (TLS) and media (SRTP);
Advanced filtering;
Advanced routing and control features; and
Intelligence to enable the firewall to act as a backup for a hosted or
centralized IP-PBX.
VoIP Logic supports a Bring Your Own IAD model which currently has all leading
IAD brands deployed in production environments including Adtran, Edgewater,
Audiocodes, NET (Sonus) and Mediatrix.
Telephones and other End User Devices and Clients
A VoIP handset or VoIP client software allows telephone calls to be made over an IP
network such as the Internet or another network scenario that uses packet
© Copyright 2013 VoIP Logic - Proprietary and confidential
switching as opposed to the PSTN. The phones and soft clients use control protocols
such as SIP or SCCP (Skinny Client Control Protocol). These IP phones can be
simple software-based soft-phones, mobile applications, purpose-built hardware
devices that appear much like an ordinary telephone or a cordless phone or
ordinary PSTN phones plugged into an analog telephony adapters (ATA).
There are a myriad of variables within the firmware of software configuration of the
device or client that create differences in what features and services it can support
or will not support. These include on-the-fly configuration of soft-keys, busy lamp
indicator, shared call appearances, insufficient number of soft-keys, inability to
mimic legacy voicemail systems, limited line-use display capabilities and problems
handling call transfer variations among others.
VoIP Logic supports a Bring Your Own Device model which currently has all leading
telephone devices deployed including Polycom, Cisco, Panasonic, Bria, X-lite, snom,
Aastra, Grandstream, Portico and Yealink.
Monitoring and Troubleshooting Platform
While each network device may provide independent monitoring and limited
troubleshooting tools, a network-wide tool is necessary to ensure proper
deployment and troubleshooting across your dispersed Hosted PBX network which
includes your core and extends out to the premises of all of your enterprise
There are several types of network assessment, monitoring and troubleshooting
tools available to include software-only, appliance and cloud-based. Cloud-based
solutions differ from other types, in that the intelligence of the system is located in
a cloud-based hosted service, enabling the appliance to be small, simple, plug-andplay and inexpensive.
Using a central hosted infrastructure to control and coordinate appliances and serve
as the central storage repository allows test planning, test execution, data
collection, correlation and reporting to become highly simplified and executed in a
lights-out manner. Most importantly, purpose built appliances can go beyond pure
call generation and act as deep packet inspection probes to perform live VoIP call
and data traffic monitoring.
As a complement to the core platform technology, VoIP Logic offers Oracle
Communications’ Palladion SIP monitoring software package. This gives Service
Providers full visibility to the call sessions traversing all aspects of the core PaaS
and complements other systems for QoS metrics to the customer premise site.
Managed Services options for monitoring often, more or less, look like the diagram
© Copyright 2013 VoIP Logic - Proprietary and confidential
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