[Sip-implementors] Re: [SIP] Clarification on sdp usage sought

[Manoj Bhatia]

 
Manish

See comments inline.

thanks
-manoj

"Manish S. Jalan" wrote:

Hello,

I am back to seek some more clarifications.

Is the following sdp description ok:  (the order of attribute definitions especially)

m=audio 1234 RTP/AVP 4 0
a=rtpmap:4 G723/8000
a=rtpmap:0 PCMU/8000
a=ptime:20
a=fmtp:4 bitrate=6300
 

This may not be illegal (given how loose the RFC is )
but I would think that it is  not the preferred way.

 
or it should be,

m=audio 1234 RTP/AVP 4 0
a=rtpmap:4 G723/8000
a=fmtp:4 bitrate=6300
a=rtpmap:0 PCMU/8000
a=ptime:20
 

This is the right definition.
The ptime parameter would correspond to G.711ulaw (payload 0) .

 
Is the ptime definition ok?
the ptime is media specific or format specific?

Please help me in clarifying the concepts.
Any help is highly appreciated.

Regards,
-Manish S. Jalan

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