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Hi All,<br>
<br>
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.<br>
<br>
Daniel<br>
<br>
Michael Giagnocavo wrote:
<blockquote
cite="mid4484BF467C2A47BAB1AA5E1D13C47C.MAI@colo901.fullcontrol.net"
type="cite">
<pre wrap="">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: <a class="moz-txt-link-abbreviated" href="mailto:asterisk-dev-bounces@lists.digium.com">asterisk-dev-bounces@lists.digium.com</a>
[<a class="moz-txt-link-freetext" href="mailto:asterisk-dev-bounces@lists.digium.com">mailto:asterisk-dev-bounces@lists.digium.com</a>] 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:
</pre>
<blockquote type="cite">
<pre wrap="">Precisely because of that - support. It's not there today, which means
</pre>
</blockquote>
<pre wrap=""><!---->it's
</pre>
<blockquote type="cite">
<pre wrap="">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.
</pre>
</blockquote>
<pre wrap=""><!---->
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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</pre>
</blockquote>
<br>
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