[Freeswitch-users] inherit_codec failing with pre-media

[Steven Ayre]

Inherit_codec requires late negotiation - is that enabled too? Otherwise
the aleg codec has already been picked before hitting the dialplan.


On Wednesday, September 18, 2013, sangdrax8 wrote:

> Did I explain a bit to much detail for the users list?
>
> Does anyone use "inherit_codec=true" and have it working?
>
>
> On Tue, Sep 17, 2013 at 2:27 PM, sangdrax8 <sangdrax8 at gmail.com> wrote:
> > I pulled the latest freeswitch from git this morning, and am still
> > having issues using inherit_codec=true.  It seems the only way I can
> > get it to defer to the choice of the b-leg call is to remove the
> > ringback, and thus the need for early media.
> >
> > My setup has 2 phones with the following codecs configured:
> >
> > phone1000:  g722, ulaw
> > phone1001:  ulaw
> >
> > My goal is to have a call initiated by phone1000 (a-leg) to defer the
> > codec choice until phone1001 (b-leg) chooses one.  This would allow
> > them to talk with no transcoding required by freeswitch.  With the
> > following dial plan, this fails to work.
> >
> > <extension name="Local_Extension">
> >       <condition field="destination_number" expression="^(10[01][0-9])$">
> >         <action application="export" data="dialed_extension=$1"/>
> >         <action application="set" data="ringback=${us-ring}"/>
> >         <action application="set"
> data="transfer_ringback=$${hold_music}"/>
> >         <action application="set" data="call_timeout=30"/>
> >         <action application="set" data="hangup_after_bridge=true"/>
> >         <action application="set" data="inherit_codec=true" />
> >         <action application="bridge"
> > data="user/${dialed_extension}@${domain_name}"/>
> >       </condition>
> > </extension>
> >
> > It does log that it is going to defer:
> >
> > 2013-09-17 13:15:10.956535 [DEBUG] mod_sofia.c:4542 [zrtp_passthru]
> > Setting a-leg inherit_codec=true
> > 2013-09-17 13:15:10.956535 [DEBUG] mod_sofia.c:4545 [zrtp_passthru]
> > Setting b-leg absolute_codec_string='G722 at 8000h@20i at 64000b,PCMU at 8000h
> @20i at 64000b'
> >
> >
> > then it tries to provide the ringback for the a-leg, and it negotiates
> > to g722 since freeswitch supports that and it is the first match.
> > Later when the b-leg is answered, it also negotiates, this time to
> > ulaw as that is all b supports.  My call completes, but freeswitch has
> > to transcode between the two.
> >
> > In an attempt to see inherit_codec work, I then commented out the
> > ringback line from the above dialplan.  With only this one change,
> > freeswitch now waits until the b-leg negotiation, and passes that back
> > to the a-leg.  The call completes and both handsets are using ulaw and
> > no transcoding is required.  The problem being that the calling party
> > never gets a ring while waiting.
> >
> > I can't imagine that the only way to use inherit_codec=true is with
> > all ringing turned off.  Can someone tell me if there is an additional
> > option I am missing?  All documentation I read seems to indicate that
> > just adding "inherit_codec=true" will fix things, but even the
> > default.xml provided as an example uses ringback and therefore fails.
>
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