I did open a ticket with SFL support and sent them the packet trace.
Interestingly, using Bria we sometimes see similar, though not exactly
the same, symptoms. That would make me wonder about the TCP stack on
the client machine, or similar.
Bria on Ubuntu is not terribly stable. Bria on the Mac works very well,
but that's a pretty expensive solution.
We are close to ditching the soft phones entirely for this call center
and going to the Digium D40. I put one of those in service this morning
and the calls are noticeably clearer and there have been no reported
problems.
Mitch
On 03/21/2013 09:48 AM, Matthew J. Roth wrote:
Mitch Claborn wrote:
Thank you for that most excellent post. I had guessed at most of the
SDP fields and meaning.
No problem. I actually like looking at SIP traces for some reason.
I have wireshark traces from the client and the RTP packets are not in
the trace, which I think means that the client software is simply not
producing them. I have opened a ticket with SFL phone support and will
post here if I find anything.
That's a reasonable conclusion. Just make sure that you get some traces of good
calls to verify that your tests are valid.
I did test the "muted microphone" theory. SFLphone continues to send
RTP packets even when the mic is muted, so that doesn't seem to be the
cause.
It's always a good idea to rule out PEBKAC before spending a lot of time
diagnosing a problem.
I've also compared the call initiation SIP and SDP packets between a
call that fails and one that works correctly. I can discern no
difference other than things like port numbers and call IDs.
Tomorrow I'll be trying one of my agents on Bria instead of SFL - maybe
that will make a difference.
It really seems like it may be a problem with the softphone. I'm sure the
developers of SFLphone will appreciate your feedback, because not sending RTP is
a pretty serious bug.
I'll keep an eye on this thread and help out if I can.
Regards,
Matthew Roth
InterMedia Marketing Solutions
Software Engineer and Systems Developer
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