[Asterisk-Dev] codec negotiation issue

[Kevin P. Fleming]

Michael Giagnocavo wrote:

> Precisely because of that - support. It's not there today, which means it's
> not in any devices out there today either. Also, it means it's not on any
> providers today. So, we're talking a long time until it's universally
> supported. However, the problem is today. And also applies to every other
> channel, if their devices don't support renegotiation.

Pretty much every SIP and IAX device you can talk to today already 
supports renegotiation during the call. The issue right now is that 
Asterisk never initiates it, when it has information that would allow it 
to do so.

I could be wrong, but I suspect that when Asterisk is ready to start 
doing this, it will 'just work' with all the providers and devices you 
are referring to. The SIP and SDP protocols already fully support it, 
and many devices already try to do it. (ever tried hitting "Conference" 
on a Cisco 7940/7960 while in a G.729 call? it sends a re-INVITE trying 
to switch the call to G.711)