[asterisk-users] audio glitches in conference

[Jonathan Addleman]

I'm having a problem with conferences both meetme and app_conference, 
though I've done most of the testing with meetme.

Essentially, I get little gaps in the audio - usually fewer than a dozen 
or so samples, though it does vary. They seem to occur at random, but I 
usually get one ever few seconds, on average. They also seem to delay 
some buffer somewhere, so that if I start recording (via eagi) after the 
conference has been established for half an hour or so, the stream 
received by the eagi script delayed by about 10 seconds.

First, the preliminaries: I'm on a debian lenny system, using the 
1:1.4.21.2~dfsg-3 asterisk package. This is a dedicated server - was 
running xen, but I've shut down all the domU's to test if they were 
interfering, so now there's no sharing going on.

I've been testing with a simple eagi script to grab the audio from the 
conference:
#!/bin/sh
cat /dev/fd/3 > /tmp/audio.raw

I've been testing it using the following dialplan extensions:
[test]
exten => testeagi,1,Answer
exten => testeagi,n,Wait(3)
exten => testeagi,n,EAGI(testeagi.sh)

exten => testmeet,1,Answer
exten => testmeet,n,MeetMe(testconf,1qd)

exten => testsound,1,Answer
exten => testsound,n,Playback(testbeep-asterisk)

(testbeep is just 30 seconds of sine wave)

I've been trying things like this:



originate Local/testsound at test extension testeagi at test

The recorded audio plays back fine - no glitches.
(an example is at http://www.vecotourism.org/audio17.wav)

originate Local/testeagi at test extension testmeet at test
originate Local/testsound at test extension testmeet at test

This does have the glitches.
(an example is at http://www.vecotourism.org/audio18.wav)

What could be causing this? And is there anything else I could be doing 
to debug it? Thanks.

-- 
Jon-o Addleman - http://www.redowl.ca