[asterisk-dev] chan_datacard and RTCP

[Steve Totaro]

On Sun, Jan 17, 2010 at 1:05 PM, Olle E. Johansson <oej at edvina.net> wrote:

>
> 17 jan 2010 kl. 17.29 skrev Artem Makhutov:
>
> > Hello,
> >
> > I am writing chan_datacard to be able to use Huawei UMTS datacards as a
> GSM gateway with Asterisk.
> >
> > Some users have complained that their calls are disconnected after
> exactly 30 seconds.
> >
> > After some investigation it came out that they were using X-Lite as their
> sofphone and that X-Lite is disconnecting calls after 30 seconds if it does
> not receive RTCP packages in that time.
> >
> > So the question is how can I get asterisk to send RTCP packets to X-Lite?
> >
> > Must I add something to chan_datacard to generate RTCP packets or should
> asterisk generate RTCP packets by its own?
> > I have no clue about RTCP. Can somebody give me some hints at what I
> should look at?
>
> Asterisk generates RTCP unless there's an p2p RTP bridge, which I guess
> won't happen if you place a call from a SIP channel to your own channel.
> Turn on "rtcp debug" in the CLI and you'll get detailed information about
> RTCP messaging.
>
> I have never heard anything about X-lite disconnecting because there's no
> RTCP reports, that's very odd.
>
> For a bit more information about RTCP, I suggest that you read my blog
> about an on-going project to enhance RTCP support in Asterisk:
>
> http://www.voip-forum.com/asterisk/2010-01/measuring-voice-quality-asterisk/
>
> /O
> --


Not sure if it is related, but 30 seconds disconnect rings a bell if you
don't Answer() in some circumstances.

Thanks,
Steve T
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