Technical Report TR/87
Using CSTA for SIP Phone User Agents
(uaCSTA)
(June 2004)
The Session Initiation Protocol (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.
This Ecma Technical Report describes how CSTA can be used to provide
a subset of CSTA call control functionality, called 1st party
call control, for SIP user agents. The term uaCSTA (for user agent
CSTA) refers to transporting ECMA-323
(CSTA XML) messages over a SIP session.
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;
by
a proxy server that is front-ending a PBX.
The following file can be freely downloaded:
| File name |
Size (Bytes) |
Content |
| TR-087.pdf |
868 722 |
Acrobat (r) PDF file |
This Ecma publication is also approved as ISO/IEC TR 22767
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