[SIPForum-discussion] different ptime for different codec

[Perttu Ahvenainen]

Hello,

Order codecs in m-line from left to right so that highest priority is in the
left. In you example below priority order is 1. G729 2. PCMU 3. PCMA.
etc.....

I found a draft that is dealing with this ptime issue but it seems that it
is still a draft. So at the moment ptime is aa common parameter for all
media formats in m-line.

http://tools.ietf.org/html/draft-garcia-mmusic-multiple-ptimes-problem-03

-Perttu Ahvenainen


2011/5/22 siddharth sharma <sid77sharma77 at gmail.com>

> Hi Forum,
>
> I have one scenario here. In SDP, I have configured single "m=" line, with
> different codec. below that I am having different a= lines, which explains
> codec information.
> for eg.
> m=audio xxxx RTP/AVP 18 0 8 4
> a=rtpmap:18 G729/8000
> a=rtpmap:0 PCMU/8000
> a=rtpmap:8 PCMA/8000
> a=rtpmap:4 G723/1/8000
> a=ptime:20ms
>
> when call will get answered with any codec, ptime will be taken as 20ms.
> Every codec has their own ptime. So I want to configure different ptime for
> different codec. I also need to configure different priority for different
> codec in same SDP.
>
> Can somebody suggest how to configure SDP in this case?
>
> Regards,
> Siddharth Sharma
>
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