Greetings!
Recently there was a problem with voice through SEMS, as B2BUA. I'm
using my own module for SEMS, but the problem is repeated in the original
modules SEMS (eg serviceline).
The problem was that after some random time intervals and not at each voice
conversation arose artifacts: the phrase duplicated, sometimes in that moment
there was only one-sided audibility.
Suspicion for the PLC, but the channel is wide and stable ping to the server
1ms, and verified at the time of voice distortion. Dedicated firewall was
disabled, the scheme has been used only sems, openser and two UA. An example of
distortion, you can listen here:
http://www.voiptroubleshooter.com/sound_files/male1_2_sil_20ms_5.wav (or other
examples of this and similar problems
http://www.voiptroubleshooter.com/problems/plc.html).
I made various attempts to remedy the situation, disable all processing in the
PLC source sems, tried different modes of channels PLAYOUT_BUFFER.
I finally conquered the problem, but not quite sure what the reason. The
following snippets of code involved in my module:
void QueueDialog::onSessionStart(const AmSipRequest& req)
{
AmB2ABCallerSession::onSessionStart(req);
rtp_str.setPlayoutType(ADAPTIVE_PLAYOUT);
.....
AmB2ABCalleeSession* QueueDialog::createCalleeSession()
{
QueueCalleeDialog* sess = new QueueCalleeDialog(getLocalTag());
return sess;
}
QueueCalleeDialog::~QueueCalleeDialog() { }
QueueCalleeDialog::QueueCalleeDialog(const string& other_tag):
AmB2ABCalleeSession(other_tag)
{
rtp_str.setPlayoutType(ADAPTIVE_PLAYOUT);
setDtmfDetectionEnabled(false);
}
It seems to me that the problem was to use various channels to `playout_buffer`
caller and the callee, but with `simple_playout` (which appears by default) the
problem was. Perhaps disable dtmf as assist. Other things to note that when
using jitter_buffer artifacts appear more frequently and consistently, but
gently.
It would like to know what is still the case, and in which direction to look.
Thanks in advance!
--
Regards,
Shpinev Konstantin mailto:[email protected]
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