Subject: [Megaco] Unique key for multiple calls on the same termination?

From: [email-masked]
Date: 27 Jul 2001 09:07:18 -0700

List,

  As per rfc3054 [megaco ipphone], when we use megaco for communication between the MGC and the ipphone, how do we uniquely identify a megaco message for a call when multiple calls are present on the same termination? 

  Scenario
  Consider the handset to be the audio transducer termination and is the same for all calls. The phone makes a first call. Then puts the call on hold, and starts with a new call. Consider the signalling to be at a stage, before AddReply is obtained from the phone. At the same time say the call agent is trying to terminate another call on the phone. Now say two messages are recieved which have "NULL" context id. How do we uniquely identify for which context, the messges are intended to.

 After the contextId has been selected by the phone, we can identify the context based on the context ID since it would be different for two calls. How do we identify before it, since the context ID may not be unique [both can be NULL].

 Is there a draft that talks about this issue. Any inputs are greatly appreciated.

Thanks,
Rajesh.    

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