[Asterisk-Users] Asterisk 1.0.8 and TDM stop acking inbound calls?

[Rich Adamson]

> My office has been running Asterisk 1.0.8 and a TDM04B for a few months 
> now without too much trouble.  After a while we discovered that after a 
> certain period (about a month), asterisk stopped acknowledging inbound 
> calls.  Since I was out of the office the first time it happened, 
> another admin rebooted the whole box which solved the problem.  The 
> second time it happened I discovered that just restarting gracefully 
> solved the problem, so I put that into my cron and forgot about it.  (I 
> know, it's not "right", but debugging something that happens 
> unpredictably once a month could go on for way too long to be acceptable..)
> 
>   Now, less than a week since I did that, asterisk stopped ringing our 
> extensions on inbound calls again.  "sip show peers" showed that 
> asterisk knew about all of the extensions.  I forgot to check "zap show 
> channels" when * was ignoring inbound calls, is it possible that * 
> thinks all the lines are still off hook?  Is there anything else I 
> should do to figure out what's causing trouble?  Unfortunately it's 
> usually something of a panic situation, so I'm not allowed the chance to 
> troubleshoot as thoroughly as I'd like.
> 
>   Speaking of, I've fiddled and tweaked left and right to get hangup 
> detection working better to no real avail.  Asterisk eventually decides 
> the far side hung up about 10 seconds after the fact.  Am I 
> understanding right that call progress is still something of a black art 
> for analog FXO devices?  Not getting 10 second dead air voicemails when 
> people hang up would be sweet. :)
> 
>   I couldn't find a changelog for 1.0.9 to see if it's worth the 
> off-hours maintenance window, and we're too dependant on the phones to 
> try 1.2.  Should I try the next step up in the probably unnecessary 
> preventative maintenance and unload/reload the wctdm module during the 
> asterisk restart?  Is there any way to have asterisk notify that it's 
> running low on/out of resources?  We don't typically ever tie up all of 
> our zap channels except for really particularly exciting days, so if 
> they are all in use it would be cause for concern..

Check the revision of the TDM card. If rev E/F, call digium support to
get it replaced. Known problem with early versions of the card.