[Asterisk-Dev] codec renegotiation and fax [was: codec negotiation issue]

[Brian West]

Someone go write format_tif.c then we can send tif files over IAX

/b

On Mar 24, 2005, at 6:29 PM, Daniel Bichara wrote:

>
>  Hi All,
>
>  So, if we make Asterisk start a renegotiation we could change the 
> codec to G.711 during a call after we detected a fax. And we will not 
> need to implement T.38 to make fax work between IAX or SIP devices. 
> Cool.
>
>  Daniel
>
>  Michael Giagnocavo wrote:
> Well, if Asterisk already supports renegotiation... that's pretty cool 
> then.
> I'd have to try it out with the PA168 phones, which are the only 
> decent IAX
> devices on the market AFAIK (although some promising ones like the 
> FarFon
> might be soon?).
>
> -Michael
>
> -----Original Message-----
> From: asterisk-dev-bounces at lists.digium.com
> [ mailto:asterisk-dev-bounces at lists.digium.com ] On Behalf Of Kevin P. 
> Fleming
> Sent: Thursday, March 24, 2005 1:03 PM
> To: Asterisk Developers Mailing List
> Subject: Re: [Asterisk-Dev] codec negotiation issue
>
> 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)
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