[Freeswitch-users] Does freeswitch try transcode g729 annexb=no to g729 annex?

[Brian West]

Its probably not even what you think it is, Its probably trying to generate
ringback and failing.

On Wed, Jul 13, 2016 at 7:35 AM, Vladislav Ivanov <deforceczt at gmail.com>
wrote:

> 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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-- 

*Brian West*
brian at freeswitch.org


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