Hello,

I have an issue with codec negotiation, seems to me that freeswitch is trying to transcode g729 to g729 annexb=no for some reason, even when I have different codecs available?

I'm bridging 2 calls, with profile settings:

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

    <param name="disable-transcoding" value="true"/>

and dialplan:

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

with global codec:

  <X-PRE-PROCESS cmd="set" data="global_codec_prefs=PCMA,PCMU,G729,G723"/>

here is invite and 183 progress message:

Session Initiation Protocol (INVITE)

    Request-Line: INVITE sip: SIP/2.0

    Message Body

        Session Description Protocol

            Media Description, name and address (m): audio 20268 RTP/AVP 18 8 0 101 13

            Media Attribute (a): rtpmap:18 G729/8000

            Media Attribute (a): rtpmap:8 PCMA/8000

            Media Attribute (a): rtpmap:0 PCMU/8000

            Media Attribute (a): rtpmap:101 telephone-event/8000

            Media Attribute (a): fmtp:101 0-16

            Media Attribute (a): rtpmap:13 CN/8000

            Media Attribute (a): ptime:20

            

            

Session Initiation Protocol (183)

    Status-Line: SIP/2.0 183 Session Progress

    Message Body

        Session Description Protocol

            Media Description, name and address (m): audio 59852 RTP/AVP 18 0 8 101

            Media Attribute (a): rtpmap:18 G729/8000

            Media Attribute (a): fmtp:18 annexb=no

            Media Attribute (a): rtpmap:0 PCMU/8000

            Media Attribute (a): rtpmap:8 PCMA/8000

            Media Attribute (a): rtpmap:101 telephone-event/8000

            Media Attribute (a): fmtp:101 0-15

            Media Attribute (a): sendrecv

            Media Attribute (a): maxptime:20

            

After that I get error message:

2016-07-13 11:29:11.136011 [ERR] mod_g729.c:102 This codec is only usable in passthrough mode!

2016-07-13 11:29:11.136011 [ERR] switch_core_io.c:1434 Codec G.729 encoder error!

and freeswitch sends CANCEL to B-side leg.

Maybe I have missed my settings, but if codecs "mismatch" shouldn't freeswitch choose g711 a/u and not try to "transcode" the codec?

Best Regards,
Vladislav

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