[Freeswitch-users] Transcoding / Call-Hold issue

Dragos Oancea dragos at freeswitch.org
Fri May 8 15:40:56 UTC 2020


Try <param name="inbound-late-negotiation" value="false"/> . See if it
makes a difference.
You can open a github issue with pcap traces.
https://github.com/signalwire/freeswitch/issues




On Fri, May 8, 2020 at 3:36 PM Carsten Bock <carsten at ng-voice.com> wrote:

> Hi,
>
> I am running a FreeSwitch 1.10 (built Debian Packages from the GIT-Branch
> due to some codec issues; AMR/AMR-WB is only available, if the respective
> libraries are present on the system).
>
> I am using FreeSwitch in the most simple configuration: FreeSwitch is
> acting as a (transcoding) B2BUA with only a single peer (Kamailio, which
> does the further distribution, Sofia Config attached), so my dialplan is
> straight forward and contains a single action:
>
> <action application="bridge" data="sofia/internal/${destination_number}@
> ${loadbalancer}"/>
>
> Here  is, what I've noticed and where I am unsure, how to fix this:
>
> 1) Call from A is sent to FreeSwitch, with Codecs AMR and AMR-WB
> 2) Call is leaving FreeSwitch towards B, offering Codecs AMR, AMR-WB,
> G722, G711, ... B-Party is selecting G722, as it does not support AMR or
> AMR-WB,
> 3) Call is connected to A on AMR/AMR-WB and to B using G722
>
> - so far, everything is fine -
>
> Now the following happens:
> 4) A puts the call on hold, so a INVITE with according SDP is sent to
> FreeSwitch
> 5) FreeSwitch itself sends an INVITE to B indicating the recognized "Hold"
> with according SDP, however now this INVITE only contains AMR-WB, which was
> initially offered to B, but which was never responded or even indicated
> support for (!?!??!)
>
> I can hardly believe, I am the first one to see this. Does anyone know
> where or what to look for and what might have gone wrong here?
>
> Thanks,
> Carsten
>
> P.S.: The first mail didn't go through, as I added my Sofia Config....
> without any notice.
> --
> Carsten Bock I CTO & Founder
>
> ng-voice GmbH
>
> Trostbr├╝cke 1 I 20457 Hamburg I Germany
> T +49 40 524 75 93-40 | M +49 179 2021244 I www.ng-voice.com
>
> Registry Office at Local Court Hamburg, HRB 120189
> Managing Directors: Dr. David Bachmann, Carsten Bock
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