asterisk users - Jun 2005 - Conversations cuts: "didn't get a frame from Channel: SIP/..."

Hello list,


I've been looking around to solve this problem both in the IRC, the wiki
and Google without any luck. 

I have a box running * 1.07 (with zaptel 1.07 and libpri 1.07) and I'm
having massive problems with random and increasing conversations cuts
both in Zap and SIP channels. 

When one starts a call or attend any, sometimes it cuts-off at 20-25
seconds without any apparent reason. It doesn't matter if it's an
internal call, an outgoing call, or an incoming one through the Zap
channels. The voice quality is OK, and the minimum duration configured
for a call is 5 minutes (max: 90 mins).

The server is an IBM with a Pentium III (1400MHz) processor and 1GB of
RAM. The HD is an IDE (no SCSI related issues). It has has 3 TE110P on
his own IRQ each one (according to /proc/interrupts), and the load of
the server is usually below 14% (i.e. 86% idle most part of the time). 2
of the cards receive a PRI while the other one connects to a Channel
Bank.

On the LAN there are almost 500 PC running Xten Xlite, 6 running Xten
Eyebeam, 15 running Kphone and 60 are Grandstream BT100 phones (with
ILBC codec as first option).

I have a queue implemented which attends a main of 20-50 calls every
hour.

Having a close look to the logs with the Debug option ON, there are a
lot of messages in many SIP channels like:

-----

messages:Jun  8 20:12:37 DEBUG[18427]: Driver for channel
'SIP/user1-8cc3' does not support indication 3, emulating it
messages:Jun  8 20:12:37 DEBUG[18427]: Prodding channel 'SIP/user1-8cc3'
messages:Jun  8 20:12:44 VERBOSE[18427]:     -- Zap/32-1 answered
SIP/user1-8cc3
messages:Jun  8 20:12:46 DEBUG[18427]: Didn't get a frame from channel:
SIP/user1-8cc3
messages:Jun  8 20:12:46 DEBUG[18427]: Bridge stops bridging channels
SIP/user1-8cc3 and Zap/32-1
messages:Jun  8 20:12:46 VERBOSE[18427]:   == Spawn extension
(macro-local, s, 2) exited non-zero on 'SIP/user1-8cc3' in macro
'local'
messages:Jun  8 20:12:46 VERBOSE[18427]:   == Spawn extension
(mobile-phones, 8531344, 1) exited non-zero on 'SIP/user1-8cc3'
messages:Jun  8 20:12:46 DEBUG[18427]: update_user_counter(user1) -
decrement inUse counter

-----


Any advice will be appreciated.

Regards,


Juan M. Coronado Z.