OpenScape Business TAPI 120

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OpenScape Business TAPI 120 TSP is a "first party" telephony service provider that supports the Microsoft TAPI V2.1 functionality. TAPI 120 enables Microsoft Windows-based CTI applications to monitor and control a phone or device connected to OpenScape Business.
OpenScape Business TAPI 120 can alternatively be connected via LAN using the WSI (WebServices Interface) to the Motherboard of OpenScape Business or via LAN to the UC Booster HW using CSTA (Computer Supported Telephony Application) protocol). A mixed operation of the interface modes to one system is not possible. If the OpenScape Business system contains a UC Booster Card or if it is connected to a UC Booster server, TAPI 120 can only be operated with the CSTA protocol.


TAPI features

The supported TAPI features depend on the kind of connection:

Overview of OpenScape Business TAPI 120 Features TAPI 120 CSTA TAPI 120 WSI
· TAPI supported functionality
– Signaling of incoming and outgoing calls with CLI and the origin of the call Yes Yes
– Additional information in the call signaling with diverted calls Yes Yes
– Call answer of internal and external calls Yes Yes
– Controlled call set up to internal and external targets Yes Yes
– Manual dialing / DTMF dialing Yes Yes
– Clear down of existing calls Yes Yes
– Recall to internal and external parties Yes Yes
– Toggle Yes Yes
– Supervised Call Transfer Yes Yes
– Supervised Call Transfer with subsequent dialing of the query target (one-step transfer) Yes Yes
– Unsupervised Call Transfer (Blind Transfer) Yes No
– Activation and deactivation of call forwarding Yes Yes
– Activation and deactivation of DND Yes Yes
– Set up a conference Yes No
– Expanding the conference Yes No
– Forward incoming call Yes No
– Directed pickup (Call Pickup) Yes No
– Group call signaling and acquisition group call (Group pickup Yes No
– Call park Yes No
– Call park retrieval Yes No
– Call hold Yes No
– Call hold retrieval Yes No
– Set callback Yes No
– Support for code-controlled functions Yes No
– exchange of call relevant data between TAPI applications Yes No
– Activation of programmable keys at system terminals (HFA) Yes No
– Control the microphone gain in system terminals (HFA) Yes No
– Control / selection of the use of Handset / loud speaker / headset with system terminals (HFA) Yes No
– volume control of handset / speaker / headset keyboard with system terminals (HFA) Yes No
– Access to optiPoint / OpenStage display and the LEDs (with limitation to 50 active displays per system) Yes No
· connection to OpenScape Business Single systems Yes Yes
· Support for OpenScape Business CTI Firewall Yes No


The TAPI 120 software is installed on a Microsoft Windows client PC. The connection to the OpenScape Business System occurs via a LAN. A physical connection between the Windows PC and the phone is not required

TAPI 120 in WSI mode

All TAPI 120 client PCs are connected via LAN, via the web server interface to the motherboard of the OpenScape business. OpenScape business internally multiplexes all TAPI 120 connections.

TAPI 120 connected via WSI

Figure: TAPI 120 in the WSI mode with OpenScape Business X5R

TAPI 120 in CSTA Mode

All TAPI 120 client PCs are connected to the same CSTA link of OpenScape Business. OpenScape Business internally multiplexes all TAPI 120 connections.

TAPI 120 connected via CSTA

Figure: TAPI 120 in CSTA mode with OpenScape Business X5R and UC Booster Card


The maximum number of TAPI 120 client PCs that can be connected to OpenScape Business depends on the model. More information on this can be found within the OpenScape Business Sales Information.


Supported Systems

OpenScape Business X3 OpenScape Business X1
OpenScape Business X5 OpenScape Business X3
OpenScape Business X8 OpenScape Business X5
Open Scape Business S OpenScape Business X8

Supported Devices

Supported are: Supported are:
The same devices which are supported by the OpenScape Business CSTA Interface. - Analogue telephones
- OpenScape Desk Phone devices (HFA)
- OpenStage devices (HFA)
- OptiPoint 4xx (HFA) / optiPoint 500 devices
- OpenScape Cordless devices (CMI)
Not supported are:
- SIP - phones
- ISDN - phones
- Mobility- / Deskshare Users
- Team/Top groups
- UCD groups


For operation of OpenScape Business TAPI 120 some HW / SW prereqisites have to be fulfilled

HW/SW prerequisites

Computer HW

The PC hardware must comply with at least the system requirements specified by Microsoft for the operating system used as well as the requirements of the TAPI application. In addition, an Ethernet LAN interface is required.

Computer SW

Operating systems

  • Microsoft Windows 7 (32/64 Bit) Service Pack: SP1
  • Microsoft Windows 8 32/64 bit except Windows RT

OpenScape Business

Regardless of the number of TAPI 120 clients a CSTA link of the OpenScape Business is required. For this purpose, a UC Booster (card or server) is a prerequisite

Requires the Web Services Interface. A UC Booster (card / server) must not be present in / on the system


Some documents in various languages are available for OpenScape Business TAPI 120. As there are:

  • Installation manuals
  • Technical release note

The documents can be obtained from the following source:

Software Delivery / Deployment

The OpenScape Business TAPI 120 software is supplied on a separate data medium. It is not part of the OpenScape Business System software. The software package can also be downloaded free of charge from the Software Download Server (SWS) within the Partner Portal of Unify.


The use of OpenScape Business TAPI 120 is licensed on a subscriber basis.
The TAPI licenses are managed within the OpenScape Business system and can be used for both TAPI 120 modes. When using the "MULAP" feature, a TAPI license is required for each station within the MULAP.
Note: TAPI 120 in the WSI Mode requires only a TAPI user licenses. A UC user licenses is not necessary.

SW Upgrade / Migration

Before migrating from HiPath 3000 with HiPath TAPI 120 V2 to OpenScape Business V1 with TAPI 120 in the WSI mode the functionality of the TAPI services should be verified in order to ensure that they are sufficient. If they are not sufficient either TAPI 120 in the TAPI 120 CSTA mode or Call Bridge Collection should be used.
Ensure that a OpenScape Business TAPI License is available within OpenScape Business for every TAPI 120 user. Existing HiPath TAPI 120 user licenses cannot be used further on within OpenScape Business.
HiPath TAPI 120 SW has to be uninstalled and to be replaced by OpenScape Business TAPI 120 SW on the client PC.


Only Microsoft Windows operating systems can be used in conjunction with TAPI 120.
For installations on terminal servers, OpenScape Business TAPI 170 must be used instead of TAPI 120.

Useful Tools

Further technical Information