Re: [Astlinux-users] Using alternative codecs for SIP stations

[Kristian K. <kri...@gm...>]

On 2/15/07, David Caldwell <dca...@ac...> wrote:
>
>  Hi guys,
>
> I've had a search through the list for this problem, but couldn't find an
> answer. Sorry if I've missed it.
>
> I've got Astlinux 0.4.0 running on a pretty beefy box. I want to experiment
> with codecs other than alaw and ulaw (I'm especially interested in gsm and
> ilbc) but when I try and force my phone (Aastra 9133i) and Asterisk to use
> other codecs by rearranging their order in sip.conf (both in general and in
> the section for my Aastra), it ignores the codec order and just uses alaw.
> If I disallow alaw and ulaw, then the call is dropped. The extension I'm
> calling is the built-in speaking clock application so the call is kept
> internally as a sip call. The only other codec I've successfully managed to
> use apart from alaw and ulaw is g726 which sounded awful.
>
> Is the Aastra not compatible with other codecs?
>
> Any ideas about how to get the other codecs to work would be much
> appreciated!
>
> Thanks,
>
> David.
>
> ______________________
>
> David Caldwell
> Access IT Limited
> t: +44(0)1227 750555
> f: +44(0)1227 750070
> w: www.accessit.co.uk
> ______________________

David,

  According to this page:

http://www.aastratelecom.com/ipphones/pro_240.asp

  That phone (like most others) only supports ulaw/alaw/g729.
Asterisk won't negotiate a codec that the endpoint doesn't support!
(At least most of the time, anyways)... :)

-- 
Kristian Kielhofner