[Freeswitch-dev] Reinvite - Codec G.729 decoder error

Kevin Mathy k.mathy at hexanet.fr
Fri Jun 7 11:39:37 MSD 2013

Hi list,
I have an issue in my Freeswich in SBC mode.

It's a call from Freeswitch to my endpoint, my endpoint answer G729, after
this 200OK, my end-point re-invite in G711A, and my freeswitch say: "Codec
G.729 decoder error".

Ex :
1) SIP Provider ----INVITE(PCMA, G729)-----> FS ----INVITE(PCMA,
G729)-----> End-point
2) SIP Provider <-----(200 OK G729)------ FS <------(200OK G729)------
3) FS <------(Re-INVITE PCMA)------ End-point
4) FS Error "Codec G.729 decoder error" in logs

In fact, it's something like http://jira.freeswitch.org/browse/FS-3739, but
the patch doesn't seem to work in our situation.

My freeswitch's conf:
*sip_profile TOTO: *
*    <!-- dtmf method -->*
*    <param name="dtmf-type" value="rfc2833"/>*
*    <!-- Payload type if the DTMF method is rfc2833 -->*
*    <param name="rfc2833-pt" value="101"/>*
*    <param name="inbound-late-negotiation" value="true"/>*
*    <param name="inbound-codec-prefs" value="PCMA,G729,PCMU"/>*
*    <param name="outbound-codec-prefs" value="PCMA,G729,PCMU"/>*

*Diaplan TITI:*
*<action application="export" data="codec_string=${ep_codec_string}"/>*
*<action application="set" data="hangup_after_bridge=true"/>*
* <action application="set" data="ignore_early_media=true"/>*
*<action application="set" data="inherit_codec=true"/>*
*<action application="export" data="t38_passthru=true"/>*
*<action application="export" data="suppress_cng=true"/>*
*<action application="bridge" data="*
*                                        {*
*                                                sip_cid_type=none,*
*                                        }*
sofia/gateway/${distributor(LISTTMP ${sofia(profile TITIPRO gwlist
We choosed to use inbound-late-negotation with inherit-codec because of our
t38_passthru option (as described here in FS wiki, I don't exactly remember

To resolve this problem, we tried to find how to make FS forward the
Re-INVITE received on B-Leg to the A-Leg, but we didn't found any
solution... If someone have an idea, it would be great ! ;-)

Thanks a lot,
Bien cordialement,
Best Regards,

**Kevin MATHY*


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