[Asterisk-Dev] codec renegotiation and fax [was: codec negotiationissue]

[Michael Giagnocavo]

>From what I've heard, fax over G711 is not a reliable solution.

 

  _____  

From: asterisk-dev-bounces at lists.digium.com
[mailto:asterisk-dev-bounces at lists.digium.com] On Behalf Of Daniel Bichara
Sent: Thursday, March 24, 2005 6:29 PM
To: Asterisk Developers Mailing List
Subject: Re: [Asterisk-Dev] codec renegotiation and fax [was: codec
negotiationissue]

 


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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