Just in case others are interested, this is possible with the following parameters:

SIP Profile:

    <param name="inbound-late-negotiation" value="true"/>

Dial-Plan:

      <action application="set" data="inherit_codec=true"/>

The codec negotiated in Call Leg B, is forced onto Call Leg A. This is possible due to the “inbound late negotiation” parameter in the sip profile.

Hope this helps someone else.

Ken

From: freeswitch-users-bounces@lists.freeswitch.org [mailto:freeswitch-users-bounces@lists.freeswitch.org] On Behalf Of Ken Fulmer
Sent: Tuesday, May 04, 2010 8:29 AM
To: freeswitch-users@lists.freeswitch.org
Subject: [Freeswitch-users] Different codecs for different devices?

This may be a far out question but here goes:

Our fax machines that are connected to ATA’s need to be g.711 on both Call Leg A and Call Leg B (in either direction).

However, our phones need to be g.711 on the internal side that faces our PBX. On the side facing our SIP provider, the calls should be transcoded to g.729. Inbound the calls to phones (not ATA’s) need to be g.729 on the inbound call leg and g.711 on the outbound call leg.

I realize we can set inbound / outbound codec preferences in single or multiple profiles and we can set the “absolute_codec_string” value for the outbound call leg.

However, I’ve yet to determine how to set the inbound call leg’s codec differently depending on the device. Is this possible?

Thanks,

Ken Fulmer