Hi Edwin,
We appear to be having the exact same problems as you are, congestion
happens at certain times of the day, we get constant messages about
hanging up on bad channel, all calls are moved to a different channel by
the exchange, often get can't fix up channel because already in use,
aapt say there is nothing wrong at their end etc.
Firstly the congestion is actually real, what is happening is that
asterisk is not releasing a line properly and so when the exchange gets
a busy signal back for over a few minutes then they permanently block
the line until a hard reset is done on the PRI. So that asterisk thinks
the line is fine but it is blocked, so when a call is made on the line
by asterisk it immediately comes back as congested. The problem seems to
occur when there are lots of calls made on the line in succession,
possibly without the call being answered. It might be that it needs to
do a restart on the channel but doesn't get a chance.
When I tried to use a more recent zaptel it worked really badly and kept
dropping all calls when it went above about 20 calls at a time.
Keiron
Edwin Groothuis wrote:
Hi,
Yesterday I updated asterisk to the latest zaptel driver and today
my congestion problems are gone... (see
http://bugs.digium.com/view.php?id=6509), only to be replaced by:
Feb 17 10:02:37 DEBUG[19225] chan_zap.c: Write returned -1 (Resource
temporarily unavailable) on channel 26
Feb 17 10:03:08 DEBUG[19274] chan_zap.c: Write returned -1 (Resource
temporarily unavailable) on channel 216
Feb 17 10:03:34 DEBUG[19334] chan_zap.c: Write returned -1 (Resource
temporarily unavailable) on channel 2
That is on zap-channels. What is going on?
Edwin
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