ISO/IEC TR 22767:2005 Preview
Information technology -- Telecommunications and information exchange between systems -- Using CSTA for SIP phone user agents (uaCSTA)
This standard was last reviewed and confirmed in 2015. Therefore this version remains current.
The electronic version of this International Standard can be downloaded from the ISO/IEC Information Technology Task Force (ITTF) web site
ISO/IEC TR 22767:2005 describes how CSTA can be used to provide a subset of CSTA call control functionality, called first party call control, for Session Initiation Protocol (SIP) user agents. The term uaCSTA (for user agent CSTA) refers to transporting ECMA-323 (CSTA XML) messages over a SIP session.
SIP is a control (signalling) protocol for creating, modifying, and terminating sessions with one or more participants. These sessions include Internet telephone calls, multimedia distribution, and multimedia conferences.
CSTA standardizes a very powerful and flexible set of application services to observe and control voice and non-voice media calls as well as control and observe non-call related features.
uaCSTA leverages SIP mechanisms to provide a highly featured, robust, and extensible set of features to support applications in the Enterprise environment.
uaCSTA can be implemented by several different types of SIP user agents:
- directly by a SIP user agent on a SIP phone,
- uaCSTA can also be implemented by a SIP B2BUA to augment 3PCC functionality, and
- by a proxy server that is front-ending a PBX.
Buy this standard
A standard is reviewed every 5 years
Revisions / Corrigenda
ISO/IEC TR 22767:2005