asterisk users - May 2006 - Sangoma A200 4 port FXO card suddenly stopped answer on channels 2, 3, 4

I've been using Asterisk 1.2.6 with a 4 port FXO Sangoma A200 card for
the past month without many problems (other than the fact that the
Sangoma card doesn't disconnect hung up calls immediately, which I
posted about in another thread, and has still not been fixed),
however, I had a call from one of our clients today and they
complained that our phone system kept ringing through when they
called.

It turns out that the Sangoma card had suddently decided to stop
answering on channels 2,3 and 4, so if someone was using channel 1,
then no other calls would be picked up.  We could, however, make
outgoing calls.  I tried restarting Asterisk and it didn't make a
difference.  I then tried restarting the Wanrouter and it started
working again.  Has anyone else run into this problem?  I really don't
like the fact that I had to restart the wanrouter for the channels to
start behaving normally again.  Our phone system is basically useless
if it randomly downgrades to a single line.  I'm going to speak to
Sangoma and see what they have to say about this, but until then, I
was hoping someone might have some advice or suggestions for me to
try.  Thanks,

Mike

Mike Garey wrote:
> It turns out that the Sangoma card had suddently decided to stop
> answering on channels 2,3 and 4, so if someone was using channel 1,
> then no other calls would be picked up.  We could, however, make
> outgoing calls.  I tried restarting Asterisk and it didn't make a
> difference.  I then tried restarting the Wanrouter and it started
> working again.  Has anyone else run into this problem?
Do you have the optional echo canceler? The echo canceler on my A20002D 
died after two months, resulting in erratic one-way audio. Sangoma sent 
a replacement after I presented my debugging efforts to my vendor 
(Telephonyware). The replacement works fine.

Try re-seating the FXO option card in the main card. The optional echo 
canceler card can also be unscrewed and re-installed.

Anyway, call your vendor about the fall-through problem.

The disconnect problems that you mentioned are the same for any FXO card 
- see 
http://www.asteriskguru.com/tutorials/resolving_hangup_detection_problems_fxo_tdm_voicemail.html.)


I use

minmessage=5
maxsilence=3
silencethreshold=128

in voicemail.conf. Seems to work reasonably well.


- Mike