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List:       sip-implementors
Subject:    [Sip-implementors]  RE: Welcome to the "Sip-implementors" mailing list
From:       "prathap" <prathap () acmet ! com>
Date:       2003-06-21 5:13:44
Message-ID: 000001c337b3$e3851810$e100a8c0 () prathap
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Hi 


In RFC 3264 An Offer/Answer Model Session Description Protocol

"For sendrecv RTP streams, the payload type numbers indicate the value
of the payload type field the offerer expects to receive, and would
prefer to send. However, for sendonly and sendrecv streams, the answer
might indicate
different payload type numbers for the same codecs, in which case, the
offerer MUST send with the payload type numbers from the answer."

"The answerer MUST send using a media format in the offer that is also
listed in the answer, and SHOULD send using the most preferred media
format in the offer that is also listed in the answer.  In the case of
RTP, it MUST use the payload type numbers from the offer, even if they
differ from those in the answer."

As per the above two statement from the RFC.
 
If suppose the stream is a sendrecv, payload types are different in
offer and answer.
So offerer will take PT from the answer and answerer will take the PT
from offer.

Is it so???

Can anybody help me on this.

Prathap




  


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