[asterisk-users] Forcing a CODEC

[isrlgb at gmail.com]

The variable for outbound is (SIP_CODEC_OUTBOUND=g722)

But I think asterisk will try to transcode then because the preferred codec on the phone is ulaw or so
 
-----Original Message-----
From: "Danny Nicholas" <danny at debsinc.com>
Sender: asterisk-users-bounces at lists.digium.com
Date: Tue, 15 Nov 2011 08:50:37 
To: 'Asterisk Users Mailing List - Non-Commercial Discussion'<asterisk-users at lists.digium.com>
Reply-To: Asterisk Users Mailing List - Non-Commercial Discussion
	<asterisk-users at lists.digium.com>
Subject: Re: [asterisk-users] Forcing a CODEC

That's one of the uses of the SIP_CODEC dialplan variable.  Just set it in
the context or the sip.conf or users.conf.  In your particular case, just
set up a specific context for the IAX calls
[iax-in]
Exten => _X.,1,Set(SIP_CODEC=G722)
Exten => _X.,n,answer()

-----Original Message-----
From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Jaap Winius
Sent: Tuesday, November 15, 2011 8:47 AM
To: asterisk-users at lists.digium.com
Subject: [asterisk-users] Forcing a CODEC

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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