Understanding the Technical Details Behind the RCC Scenario

Office Communicator 2007 R2 has to send call-related information to and receive call-related information from the SIP/CSTA gateway. When Office Communicator 2007 R2 starts, it establishes a long-term SIP dialog with the SIP/CSTA gateway to transmit call control–related information on incoming calls, on outgoing calls, or in call commands, and it keeps this dialog established until Office Communicator 2007 R2 is shut down. SIP INFO messages are used to send call-related information to and from the SIP/CSTA gateway. The call-related information is encoded as XML, which is the payload of these SIP INFO messages.

In Office Communicator 2007 R2, the SIP implementation follows ECMA Technical ...

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