[asterisk-users] Forcing a CODEC

[amit anand]

Remove all other codec
On Nov 15, 2011 8:17 PM, "Jaap Winius" <jwinius at umrk.nl> wrote:

> Hi folks,
>
> How can I take advantage of a high-bandwidth CODEC, like G.722, for
> internal communications at my site, but use G.711 (alaw/ulaw) for all other
> outgoing calls? I need G.711 to support Inband DTMF signaling.
>
> As my site has multiple locations that are tied together with IAX trunks,
> I was hoping that it would be possible to specify alaw and ulaw as the
> first two CODEC choices for the SIP phones, as well as in their sip.conf
> configurations, but that I could use the IAX trunks (with bandwidth=high)
> to force the phones to use their third CODEC choice, g722, because that
> would be the only CODEC specified for the IAX trunks (following
> disallow=all).
>
> Unfortunately, that doesn't work. Although the Asterisk console reports
> that g722 is being used, when I listen to the connection it's obvious that
> a G.711 CODEC is being used. Curiously, the reverse does work: if g722 is
> specified as the first CODEC of choice for the phones, it is possible to
> use the IAX trunks to force them to use alaw/ulaw instead.
>
> Is a solution to this problem?
>
> I'm using Debian squeeze with Asterisk 1.6.2.9.
>
> Cheers,
>
> Jaap
>
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