OpenScape Desk Phone IP (SIP)

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OpenScape DP IP 35G persp.jpg OpenScapeDP IP 55G.jpg
OpenScape Desk Phone IP 35G OpenScape Desk Phone IP 55G
The OpenScape Desk Phone Training Videos

The OpenScape Desk Phone family consists of the SIP phones shown on the right.

You can download the Open Source Software used in this phones.


Phone range

Example of an administration settings screen on OpenScape Desk Phone IP 55G

Common features

The OpenScape Desk Phone IP family have a wide common feature set (listed below) and additional features per model (specified for each phone model).

Hardware related differentiating factors


Display features OpenScape Desk Phone IP 35G OpenScape Desk Phone IP 55G
Technology LCD TFT
Color Monochrome 16 bit depth
Size 205x41 pixel 320x240 pixel (QVGA)
Diagonal N/A 5.7"
Lines 2 (34 characters each) Graphics


Keys and LEDs features OpenScape Desk Phone IP 35G OpenScape Desk Phone IP 55G
Fixed function keys (Pushbuttons) 10 (6 with red LEDs) 14 (9 with red LEDs)
Freely programmable keys 3 (keys with red LEDs) 8 (keys with red LEDs)
Optical call alert Red LED Red LED
Volume adjustment via +/- keys via +/- keys
Navigation element 3 navigation keys 4 way navigator

Built-in applications

Application OpenScape Desk Phone IP 35G OpenScape Desk Phone IP 55G
Call handling tick.gif tick.gif (graphical)
Phonebook Personal phonebook (with V3.3)
Directory access
(LDAP with V3R3)
Personal phonebook
Directory access
Call log / history tick.gif tick.gif
Mailbox tick.gif tick.gif
Menu/Services tick.gif (User/Admin) tick.gif (User/Admin/Applications)
Help - tick.gif


Interfaces OpenScape Desk Phone IP 35G OpenScape Desk Phone IP 55G
DECT Headsets tick.gif tick.gif
Headset jack (121 TR9-5) tick.gif tick.gif
USB Master - tick.gif

Software/Firmware related differentiating factors

The telephony application provides a set of features and the connectivity to a set of SIP systems (proxies, application servers)

  • General overview on platforms / systems:
Platform Comment Details
OpenScape Voice IP-Softswitch V7R1
Asterisk IP-Softswitch Asterisk >= V1.4

For detailed interoperability information please check Software version and Interoperability sections on this page.
Connectivity to several VoIP providers is supported.
For configuration hints see the How To article.

It could be possible that particular function on the phone are not available or working.
This may be due the reasons that the communications platform does not feature this function

Supported Languages

See OpenScape Desk Phone IP Supported Languages.

Supported Country Tones

See OpenScape Desk Phone IP Supported Country Tones.


All OpenScape Desk Phones are shipped with a printed document providing brief instruction regarding installation and operation. For both user and administrators, a comprehensive and updated documentation is provided as PDF files.

symb-docu.gif More documentation in further languages for OpenScape Desk Phone telephones can be found on

International (English)  English

Quick Reference Card

Quick Reference Guides

User Manuals



Deutschland  Deutsch

OpenStage Training

International (English)  English

Deutschland  Deutsch

Firmware / Software

The SIP firmware provides encryption capabilities. Hence its distribution must follow legal requirements which do not allow unrestricted SW distribution via the Internet. The firmware is only provided by Siemens technicians or by official Siemens Partners. Customers with self-care contracts will have access to SW within the SEBA Web portal (login required).

The Application software of the OpenScape Desk Phone IP phones can be transferred to the phone:

Current software releases

The current application software of OpenScape Desk Phone IP V3 is R2.5.0. Please have a look at OpenScape Desk Phone and Asterisk for additional information about software releases and features for Asterisk based solutions.

Version Release Release date Release note
V3 R2.5.0 26/01/2012 OpenScape Desk Phone V3 R2.5.0

To get an overview of all release notes for the OpenScape Desk Phone IP family see the history of all Release Notes.

Interoperability Matrix

For detailed interoperability information please check OpenScape Desk Phone IP interoperability matrix.

OpenStage Manager

The OpenStage Manager is a comprehensive and powerful tool for your OpenScape Desk Phone 55G telephone. The main function of the OpenStage Manager is to serve as an interface between your phone and PC, thus enabling convenient phonebook editing on your PC. OpenStage Manager allows you to synchronize contacts in Microsoft Outlook with the contacts in your telephone.

Mass deployment

See Mass Deployment.

Add-On devices, Adapters and Accessories

See OpenScape Desk Phone Accessories.

See also

Show IP related