Hi, I was talking to a technican at our telco yesterday and he told me that this problem was most likely caused by our PBX sending "channel identification" Exclusive when we dial out. If there's a heavy load and someone is dialing in on the same time on the same channel that we try to dial out from - it causes a deadlock. He said some Cisco PBXs have the same problem.
Now, I'm no asterisk expert and I don't quite understand what this means. I've emailed the list asking if this can be changed to Preferred or Negotiation as the technican told me to. But I got no response yet. I did however "solve" the problem by reversing the channels that we dial out from (so now it tries the last channel first and then backwards to the first). Since all of our incoming calls come from the first to the last this minimizes the risk of a "collision" of the incoming/outgoing calls. This is of cource no long-term solution but anyway. I need to know if it's possible to change "channel identification" (whatever that is) to preferred or negotiation. Regards, Jan Martin Smith wrote: Hello Jan, We have also been seeing this issue, and we are running Asterisk 1.2.17/Zaptel 1.2.16/LibPRI 1.2.4-r2. We have been informed by our PRI provider that a "3rd party vendor" has applied firmware to some hardware along our path, and that it has an unfortunate bug of hanging B-channels in the PRI flags "resetting" state. We have been assured that the vendor has been given a 30-day deadline (starting maybe 2 weeks ago) to fix the problem, and that it will go away soon. In the mean time, we've also had to restart Asterisk to free our B-channels for use, and any link-level event potentially re-hangs them. Keep us posted if you find out anything! Martin Smith, Systems Developer martins at bebr.ufl.edu Bureau of Economic and Business Research University of Florida (352) 392-0171 Ext. 221 > -----Original Message----- > From: asterisk-users-bounces at lists.digium.com > [mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of > jan.sarin at securia.se > Sent: Tuesday, July 17, 2007 9:44 AM > To: asterisk-users at lists.digium.com > Subject: [asterisk-users] Zap channels unavailable? > > Hi, > > Lately we've noticed that some Zap channels on one of our PRIs are > unavailable. We have 2 PRI lines with 60 channels in total. > On the first > PRI there are currently 20 channels that are not being used for some > reason. > > I tried googling around and found some similar problems but > there really > was no solution (?). I'm not sure if this problem has occured now > because of more load on the pbx but the machine should take > it just fine > (2x3,0 ghz xeon with 1 gb ram etc). > > Restarting asterisk makes the zaps' available again but they get > "locked" later again. It seems it's always the same channels that are > unavailable too? > > This one is unavailable and not being used... It's been in PRI Flags > state "resetting" for hours now. > > Channel: 1 > File Descriptor: 11 > Span: 1 > Extension: > Dialing: no > Context: from-pstn > Caller ID: 702821667 > Calling TON: 33 > Caller ID name: > Destroy: 0 > InAlarm: 0 > Signalling Type: PRI Signalling > Radio: 0 > Owner: <None> > Real: <None> > Callwait: <None> > Threeway: <None> > Confno: -1 > Propagated Conference: -1 > Real in conference: 0 > DSP: no > Relax DTMF: no > Dialing/CallwaitCAS: 0/0 > Default law: alaw > Fax Handled: no > Pulse phone: no > Echo Cancellation: 128 taps unless TDM bridged, currently OFF > PRI Flags: Resetting > PRI Logical Span: Implicit > Hookstate (FXS only): Onhook > > If anyone can help me with this I'd be really glad. Thanks. > > Regards, > Jan > > _______________________________________________ > --Bandwidth and Colocation Provided by http://www.api-digital.com-- > > asterisk-users mailing list > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-users > _______________________________________________ --Bandwidth and Colocation Provided by http://www.api-digital.com-- asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users