[Asterisk-Users] Clicks in audio with TE100P PRI

[Alejandro G]

I tested all again. No matter if span=1,1,0  or span=1,0,0 if I configure
jitterbufer=4 I have glitches that I'm almost sure that are "holes" in
audio.

If I raise jitterbufer=16 the problem disappear (or becames impercetible).
Anyway I am interested in understand what is happening.

> Your issue is very likely the size of the zaptel jitterbuffers setting. If
the zaptel driver is not
> immediately available to accept a frame of data it places it in an
internal queue of pending writes.
> If that queue is full then the write is refused by the zaptel layer and
then silently discarded by
> chan_zap causing a gap in the audio once it is played out of the zaptel
card. If you crank up the
> debug level you will probably see 'Write returned -1...' (aka. EAGAIN)
debugs that mostly correlate to
> the pops and clicks. Note that the zaptel driver legitimatly (if perhaps
not appropriately) also
> refuses data when the channel is muted, such as during DTMF generation and
at other times, so not
> _all_ EAGAIN debugs are a sign of problems.


This makes perfect sense but again some issues of the problem do not match.
I set debug at level 9 and  there is no message of errors. Another thing I
do not understand is why the same configuration:

PAP2 <-> LAN <-> Asterisk <-> TE100P  works perfect, and instead of LAN
using internet generates the problem. Shouldn't it be the same for both
configs?

The only difference I see is that the rtp packets came from another Ethernet
card, but if I call to terminate calls with another carrier using that eth
works fine.

What is clear is that jitterbuffer=16 corrects the problem.

One more thing: no matter what codec I use, G729 or G711 the sound clicks
are almost the same.

Is anyway I could debug at RTP level in asterisk to see what is happening
and check if there is packet loose?

Thanks

Alejandro