[Asterisk-Users] Problem with intermittent one-way audio

[Barry Flanagan]

Hi,

I have a 1.2.4 asterisk box at a remote location, which is using IAX2 to
connect to a 1.2.5 box for PSTN. There are 15 users on the remote
server, all connecting via SIP softphones.

For some reason, there is an increasing number of calls where the callee
 does not get any audio although the caller can hear them perfectly.
This happens between 5% and 10% of the time. If they hang up and call
again, it usually works.

I have tried both with trunk=yes, and trunk=no but they are still having
the problem. The debug log has a lot of the following, but not much else
to go on.

Mar 20 19:26:37 DEBUG[26754] chan_iax2.c: Received VNAK: resending
outstanding frames
Mar 20 19:26:37 DEBUG[26754] chan_iax2.c: Received VNAK: resending
outstanding frames
Mar 20 19:26:37 DEBUG[26754] chan_iax2.c: Received VNAK: resending
outstanding frames
Mar 20 19:26:37 DEBUG[26754] chan_iax2.c: Received iseqno 18 not within
window 19->19

Any help much appreciated.

-- 

-Barry Flanagan