Introduced with IP Office Release 11.1, MTCTI-3 Web Services provide third party control, including for groups, and offers an alternative to 3rd Party TAPI. The Web Services also include a number of additional features over its TAPI predecessor.

MTCTI-3 Web Services enable an application to observe call activity on both users and queues, and acquire presence activity. Using MTCTI-3, an application can manipulate some user configuration parameters and perform call control on users. An application employing the protocol can also manage queue membership, change queue service mode, and observe and manipulate calls in queues, even after the call is answered. The Web Services are offered via protocol buffers over a websocket which is rendered directly by Avaya IP Office and does not require the installation of any additional components, such as Avaya one-X Portal.

In release 11.1 the MTCTI-3 Web Services interface is supported on the Linux-based IP Office Server Edition platform and applications can interface to the IP Office Primary Linux server and manage information for the Primary server as well as expansion servers (Linux as well as IP 500v2). Beginning in release 11.1 Feature Pack 1 the Web Services are also supported on the standalone IP Office 500v2 platform.

The IP Office MTCTI-3 Web Services Resources are available for download from the DevConnect portal, under Releases -> Downloads -> MTCTI-3 Web Services for the release of IP Office you are using.