Subject: [Megaco] doubts in reserve property

From: mukta vasudeva <[email-masked]>
Date: Wed, 4 Dec 2002 05:25:03 +0000 (GMT)

When Reserve Value or Reserve Group is true, multiple resources  are reserved in MG. How does the MG decide to use a particular resource from the available options that it has already reserved. 

E.g.  MGC specified ReserveValue= True & 

Local Descriptor looks like:

Local={

v=0

o=...

s=...

c=ATM ...

m=audio ? RTP/AVP 0 1

}

In response MG reserved both the codec types specified.

So at which point does the MG find out which of the two codecs that it has reserved resources for will be used?

But the Rfc Specifies :  If the Mode property of the LocalControl descriptor is 

         RecvOnly, SendRecv, or LoopBack, the MG must be prepared to 

         receive media encoded according to any of the alternatives 

         included in its response to the MGC. 

Does the above clause mean that in this case MG has to recognize the Codec Type dynamically, that is, Codec Type  will be determined from the RTP header field : Payload Type?

Relevant Clause from RFC : page 31. : If media begins to flow while more than a single alternative is  reserved, media packets may be sent/received on any of the  alternatives and must be processed, although only a single  alternative may be active at any given time. 

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