I thought this problem with PRI and channels getting out of sync was fixed in
the 1.2.x release of Asterisk. Here are the errors:
Jan 5 13:59:05 WARNING[1253]: chan_zap.c:8360 pri_dchannel: Ring requested on
channel 0/2 already in use on span 1. Hanging up owner.
Jan 5 13:59:11 WARNING[1253]: chan_zap.c:8360 pri_dchannel: Ring requested on
channel 0/2 already in use on span 1. Hanging up owner.
Jan 5 13:59:13 WARNING[1253]: chan_zap.c:8360 pri_dchannel: Ring requested on
channel 0/2 already in use on span 1. Hanging up owner.
Jan 5 13:59:14 WARNING[1253]: chan_zap.c:8360 pri_dchannel: Ring requested on
channel 0/5 already in use on span 1. Hanging up owner.
Jan 5 13:59:15 WARNING[1253]: chan_zap.c:8360 pri_dchannel: Ring requested on
channel 0/2 already in use on span 1. Hanging up owner.
Further testing and it shows the same patterns as before. Using Queues,
callback agents, and SIP phones. Once a channel gets out of sync(always one
with the queue) then no new calls can come in on the PRI line. Existing calls
are fine however. In addition trying to do anything in the CLI dealing with
queues results in no response and the refusal to do anything else in the CLI and
it has to be killed and connected again. Asterisk also can't restart itself
cleanly in this state and has to be fixed.
We never tracked the problem down and people with similar reports said the
problem didn't occur in 1.2...and it does us :(
Restarting Asterisk seems about the only way to prevent the deadlock and in a
production PBX that accepts calls 24/7 that isn't acceptable...
--johann
