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199 Early Dialog Termination Support

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For example, a User Agent Client (UAC) might receive multiple 18x responses from different destinations creating multiple early sessions, when a downstream entity forks the request. The forking entity, on receipt of final response from one of the forked branch, it can use 199 response code (i.e. if the UAC supports 199) to indicate the termination of that particular early dialog. The forking SIP entity might wait for ‘best response code’ and hence cannot send a final response upstream yet. A 199 early session termination indication will help the UACs to release any resources associated with corresponding early session immediately.

The following MMTel supplementary services use 199 response code:

• Communication Completion Services (CCNR in particular)
• Customized Alerting Tones (CAT)

Refer to Supplementary Services topic for a list of MMTel supplementary services.

The CLI syntax to enable the

support199OptionTag flag is shown below:

% set addressContext <address context name> zone <zone name> sipTrunkGroup <TG name> signaling support199OptionTag 

enabled

MMTel Transparency Support

Event Transparency

The

Spacevars
0 product

 transparently passes the following content types associated with the specified MMTel services:

Caption
0 Table 1 Content Types for Event Transparency 3 Content Types for Event Transparency
Service Name Method Event Name Content Type CDIV SUBSCRIBE comm-div-info application/comm-div-info-filter+xml CDIV NOTIFY comm-div-info application/comm-div-info-ntfy+xml CCBS SUBSCRIBE (O-AS subscribes to T-AS if the user is Busy) Call-Completion   CCBS NOTIFY (O-AS subscribes to T-AS if the user is Busy) Call-Completion   application/call-completion CCBS Publish (If the CCBS service fails, O-AS sends Publish with closed as state to T-AS) Presence application/pidf+xml

 

Message Body Transparency

The

Spacevars
0 product

 transparently

passes the following content-types associated with the specified MMTel services:

Header Transparency

The