Re: [Sip] Changing SSRC/sequence numbers during a call

[Colin Perkins <csp at csperkins.org>]

On 12 Oct 2006, at 05:12, <sreeram.kanumuri at wipro.com> wrote:
> SSRC is used per session as an identifier of the source. It will  
> not be changed in a Session.

The SSRC of a participant can change within a session if there is a  
collision (as noted below), or if the participant generates multiple  
streams within the session. For example, if a participant has two  
cameras and switches between then, the video from each camera should  
use a different SSRC [RFC 3550 section 3].

> In a session, if there is a collision with the SSRC from the other  
> side it should be changed (This is a very rare case!!)
>
>
>
> Ina video call, where you have audio and video for each medium a  
> SSRC is used.
>
> So what type of call are you making? Is it a multimedia call?
>
>
>
> Questions related to RTP can be posted @ rtp at vovida.org

Or to the IETF AVT working group <avt at ietf.org> which designed RTP.

Colin

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