Yes, they can have the same. While parsing, a=rtpmap takes the highest 
precedence.

We had encountered a similar situation in iterop where in we had to change the 
code to take from the a=rtpmap as the precedence, rather than static payload 
numbers.
But yes, if a=rtpmap for the corresponding number is absent, we can go 
according to RFC 3550/RFC551.

Regards,
Somesh 

-----Original Message-----
From: sip-implementors-boun...@lists.cs.columbia.edu 
[mailto:sip-implementors-boun...@lists.cs.columbia.edu] On Behalf Of ext Aman 
Aggarwal
Sent: Friday, October 14, 2011 11:11 AM
To: sip-implementors
Subject: [Sip-implementors] Dynamic codecs having same payload name as of 
static codecs

Hi All,

Can the dynamic codec have the same payload name as that of static codec in 
rtpmap attribute?

Please check the below SDP format:-

   m=audio 32420 RTP/AVP 8 0 98 99
   a=rtpmap:8 PCMA/8000
   a=rtpmap:0 PCMU/8000
   a=rtpmap:98 PCMA/8000
   a=rtpmap:99 PCMU/8000

RFC 3264 do mention that dynamic codecs must have rtpmap attribute but can they 
have same name. Please provide some inputs.

Regards,
Aman Aggarwal




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