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