[Asterisk-video] Re: Re: [Iaxclient-devel] Video codec negotiation in IAX

[Mihai Balea]

The main reason for this is that RTP packets carry media type  
information in the header.
In IAX, we'll probably have to use a full frame for this (mini frames  
have only minimal information in their 4-byte headers).
It would be doable, but it will probably require some changes in the  
way codecs are negotiated.
Something to think about....

Mihai


On Oct 25, 2006, at 4:26 AM, Olle E Johansson wrote:

> The interesting part in all of this is that Asterisk is able to  
> negotiate a SIP call with
> multiple codecs, and change codec mid-call without re-negotation.  
> The RTP stack
> will just notify that we changed codec and the translators seems to  
> be in place
> somehow. I have no idea on the inner workings, but it works.
>
> In that case, no re-invite is needed, since it was already negotiated.
>
> /O
>