OpenScape Cordless IP
The SIP-based cordless solution
OpenScape Cordless IP upgrades IP communications systems by a campus-wide mobility
Providing staff with cordless phones
allows for direct, location-independent
communication and is ideally suited
for instant availability and enabling decisions to be taken quickly. This generates organizational and economic advantages.
The flexibility in the number of stations, station frequency, surface coverage, upgrading and the provision of
comfort functions with the most modern handsets characterize the system
architecture of OpenScape cordless IP.
The digital transmission standard
DECT (Digital Enhanced Cordless Telecommunication) is used worldwide
and works in a secured frequency
The OpenScape cordless IP solution
also makes the established DECT standard available in Voice over IP infrastructures. SIP (Session Initiation Protocol) is used to connect to the communication systems. This enables DECT
cells to optimally complete SIP-enabled Voice over IP systems as the basis
for mobile communication solutions.
Multi-cell technology
The radio coverage required in the
building or on company grounds is
achieved by means of multi-cell technology. The synchronized cells of the
base stations installed at the company
overlap, so that calls in the entire area
of the cordless system can be seamlessly set up and made on the move (roaming and handover).
A high degree of flexibility and mobility makes the OpenScape DECT Phone
S5 and OpenScape DECT Phone SL5
handsets for office environments, and
the OpenStage M3 handsets for industrial environments to favorites among
the cordless telephones.
The handsets offer excellent digital
speech quality, a high degree of immunity to eavesdropping, and a long range
(up to 50 meters indoors and up to
300 meters outdoors).
As well as low investment and operating costs, the phone provides simple
user prompting in connection with the
mode-dependent menu keys. This enables optimal access to the large range
of comfort features.
Base station
Base station
OpenScape Cordless
IP Software
Base station
Configuration/System concept
A further advantage is the access security in the entire OpenScape Cordless
IP system, where central registration of
the handsets in the system restricts access by unauthorized cordless telephones.
The OpenScape Cordless IP handsets
allow calls to be made in the area covered by the network.
Handsets enable the most important
SIP comfort features of the communications systems to be used on the move
within the site.
Detailed information on the individual
handsets can be found in the data
sheet for "OpenScape DECT, Handsets,
OpenScape Cordless IP
The OpenScape cordless IP software
provides the interface between base
stations on the one hand and the communications systems on the other.
Router and protocol converter
The software offers the router and protocol converter functions by controlling the voice connections between the
communications systems and the respective base station. It also converts
these into a data format which the base
stations can use.
Technical data
System data
• Radio interface standard:
DECT (ETS 300 175),
GAP (ETS 300 444)
• Frequency range (Europe):
1880 MHz up to 1900 MHz
1910 MHz up to 1930 Mhz (LAM)
• Number of carriers: 10 to 12 full
duplex channels
• Voice encoding: 32 kbit/s ADPCM
• CE standard (safety)
System configuration
DECT IP base stations
Configuration and
The OpenScape Cordless IP software
runs on one of the base stations.
The base stations form a network of
wireless cells and manage communications with the handsets. The multi-cell
technology enables subscribers to
move between the wireless cells with
their handsets during a call.
The base stations and the OpenScape
cordless IP software itself are all administered and configured using the
web-based management of OpenScape
cordless IP software.
• Interruption-free call transfer is
possible within up to 10 base stations.
The software of the base station contains complete DECT and IP functionality. The software does not need to be
configured and administered locally
for each base station but instead can be
conveniently operated centrally via
the OpenScape cordless IP software.
Synchronization management
The optimal location of the base stations for coverage of a building or of a
site is determined by a radio analysistechnical measurement.
Accurate time synchronization is also
necessary between the base stations
for an interruption-free call transfer.
Special antennas can be used to
increase the range.
Synchronization via DECT (synchronization over the air)
The base stations can be encased to
protect them from the weather.
A DECT IP base station must be within
the overlapping area of the cell which
this DECT IP base station forms in order to synchronize with another DECT
IP base station via the DECT interface.
In DECT systems with line-switched
connection, e.g. OpenScape cordless
Enterprise, the synchronization information is attained from the connection. This is not possible with the
OpenScape cordless IP system.
Synchronization via LAN
With this type of synchronization, the
DECT IP base stations can be synchronized via LAN. This is based on a method similar to IEEE1588.
• Up to 10 parallel calls are possible
within this group.
• Up to 50 Unify DECT devices can be
The OpenScape Cordless IP software
runs on a dedicated base station
with deactivated DECT interface.
• Interruption-free call transfer is
possible within up to 60 base stations.
• Up to 50 parallel calls are possible
within this group.
• Up to 250 Unify DECT devices can be
The management of the OpenScape
Cordless IP system runs on a virtual
• The virtual server manages up to 100
DECT Managers. Up to 60 base stations can be operated on each DECT
• Up to 10 DECT Managers and their
base stations can be connected to
form a handover domain, i.e. uninterrupted call handover is possible
between these base stations.
• Up to 5,000 parallel calls are possible
in the overall system.
• Up to 25,000 Unify DECT devices can
be operated.
Features of the SIP interface
Network requirements
DECT IP base stations
In addition to the DECT handsets’ features, such as the redial list or integrated phone book, the following features
are made available on these handsets
by the OpenScape Cordless IP solution
in connection with the communications systems:
In addition, the following specifications between the base stations and
the OpenScape Cordless IP software in
the IP network must be adhered to:
• Maximum number of DECT channels: 120
• DECT signaling in accordance with
• IP interface - Ethernet network connection: 10/100 Base T
• PoE class 2 in accordance with
• Power consumption: < 4 W;
PoE class 2
• Integrated Internet/Intranet server
to access web-based management
• Antenna diversity support
• Software download/update centrally via the OpenScape cordless IP
Outgoing/incoming calls
Number identification (CLIP)
Name display (CNIP)
Hold – incl. music on hold for holding subscribers
Forward when busy
Forward when no reply or always
Attended/unattended transfer
Ringer tone mute for incoming calls
Call reject
Time and date display on idle screen
Internal/external call ringer differentiation
Missed call list on vacant DECT
handset incl. MWI signaling
Received call list
Voicemail display incl. MWI signaling
• DTMF transmitting
• Integration of DECT handsets in
MULAP groups
• Group call is possible between the
DECT handset and OpenStage, i.e.
both phones ring for incoming calls.
When the call is accepted on one of
the two phones, the other phone
stops ringing.
• Second line incl. call waiting tone
• Call completion for OpenScape
• Signaling on DECT handsets in call
pickup groups for OpenScape Voice
• Phone book options:
Enterprise-wide phone books: LDAP
access over the DECT handset,
Group-wide phone book: Cordlessinternal phone book,
Private phone book: Handset-internal phone book
SIP Survivability features for OpenScape Voice
Outbound proxy support
DNS administration
DNS SRV support
Penalty box functionality
SIP notify messages
• Both of them must be part of the
same Ethernet segment. Layer 3
routing over an IP router and Network Address Translation (NAT) are
not supported.
• At least 2 priority classes in accordance with IEEE 802.1 p/q in the IP
• Use of 100 Mbit/s full duplex for all
switched LAN ports.
Otherwise, this will result in delays in
the IP network and cause synchronization and voice quality problems in the
DECT handsets.
Released systems and
The following Unify communication
systems can be connected to OpenScape Cordless IP:
• OpenScape Business from V2
• OpenScape 4000 from V8
For the communications system, the
OpenScape Cordless IP software also
• Virtual Local Network (VLAN) support
• Quality of Services in the network:
Layer 2 prioritization (802.1p/q),
Layer 3 prioritization (ToS, DiffServ)
• DHCP options - DCHP active or local
entry of IP addresses
• OpenScape Voice from V9
The following Handsets are supported
by Opencape Cordless IP:
• OpenScape DECT Phone S5
• OpenScape DECT Phone SL5
• OpenStage M3 family
Base station indoor:
• Housing dimensions
(Length x width x depth in mm):
182.3 x 113.1 x 42.2 without antennas
226.5 x 187.3 x 42.2 with antennas
• Weight: approx. 0.3 kg
• Climate in accordance with the
IEC721-3-3 class 3K3 standard
• Temperature range: +5 °C to +45 °C
• Storage temperature range:
-5 °C to +45 °C (23 °F to 113 °F)
External casing for base station:
• Housing dimensions
(Length x width x depth in mm):
296 x 256 x 90
• Weight: approx. 1.0 kg
• Climate in accordance with the
IEC721-3-3 class 4K2 standard
• Temperature range: -25 °C to +40 °C
• Relative humidity when operated
with outer housing: up to 95%
Order items
Order item
Order number
OpenScape Cordles IP V2 - Base Station BSIP2
OpenScape Cordless IP V2 - Base
One-port Power over Ethernet injector
OpenScape Cordless IP V2 - DECT Manager license
Mains cable EU 2.5 m
Mains cable UK 2.5 m
Mains cable SWZ 2.5 m
OpenScape Cordless IP V2 - Integrator Software
External casing for base station
Pole mount for external casing
Copyright © Unify Software and Solutions GmbH & Co. KG, 11/2017
Mies-van-der-Rohe-Str. 6, 80807 Munich/Germany
All rights reserved.
Reference No.: A31002-C1020-D100-1-7629
The information provided in this document contains merely general descriptions or
characteristics of performance which in case of actual use do not always apply as
described or which may change as a result of further development of the products.
An obligation to provide the respective characteristics shall only exist if expressly
agreed in the terms of contract.
Availability and technical specifications are subject to change without notice.
Unify, OpenScape, OpenStage, Circuit and HiPath are registered trademarks of
Unify Software and Solutions GmbH & Co. KG. All other company, brand, product and
service names are trademarks or registered trademarks of their respective holders.