[Freeswitch-users] How to inspect the jitterbuffer?

Holger Freyther holger at freyther.de
Fri Feb 10 12:41:43 MSK 2012

Anthony Minessale <anthony.minessale at ...> writes:

> what does /etc/wanpipe/wanpipe1.conf look like? and which rev of FS
> and wanpipe driver are you on.
> What ptime is the sip traffic?


the wanpipe1.conf is here[1], I am using wanpipe 3.5.24, I started
with a FreeSWITCH from around 20111010, but I retested with the
a version from 20120205.

What I have done so far to try to understand things:
fs_cli> originate freetdm/1/nr &echo(1000)
(audio quality is good in both ways, so FreeTDM by itself
appears to work)

On a 'normal' SIP call (the path to ISDN produces the skips):
I used the 'bug' application to record the audio file and it had
no skips. Wireshark's RTP Analysis shows no packet loss, little
jitter, just a bit of clock drifting.

To me it looks like if FreeTDM doesn't get the audio samples in
time and then 'nothing' is transmitted. This is why I asked about
inspecting the state of the jitterbuffer.


[1] http://paste.lisp.org/display/127633

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