[asterisk-users] PRI DCHAN Errors

[Rob Schall]

Hey all,

I had a user complaining of calls which were dropping mid-conversation.
I looked into the time of one of the calls, and saw the following:

Apr  4 12:13:03 WARNING[6670] chan_zap.c: No D-channels available! 
Using Primary channel 28 as D-channel anyway!
Apr  4 12:13:05 WARNING[6660] channel.c: Avoided initial deadlock for
'0x82b8430', 10 retries!
Apr  4 12:13:05 WARNING[6660] channel.c: Avoided initial deadlock for
'0x82d9920', 10 retries!
Apr  4 12:13:05 WARNING[6660] channel.c: Avoided initial deadlock for
'0x82369f0', 10 retries!
Apr  4 12:13:05 WARNING[6660] channel.c: Avoided initial deadlock for
'0x8242968', 10 retries!
Apr  4 12:13:06 WARNING[6670] chan_zap.c: No D-channels available! 
Using Primary channel 28 as D-channel anyway!
Apr  4 12:13:09 NOTICE[15466] app_dial.c: Unable to create channel of
type 'Zap' (cause 34 - Circuit/channel congestion)
Apr  4 12:13:11 NOTICE[6670] chan_zap.c: PRI got event: HDLC Abort (6)
on Primary D-channel of span 2

I have read that some people believe this is a driver problem, which
others believe something could be wrong with the PRI itself. I did a
zttool and there are and haven't been any red alarms. I also read some
people believe this issue can be caused by another card in the box
taking too long to respond, such as an IDE card. We have 2 sangoma PRI
cards and 1 sangoma FXO/FXS card.

Any thoughts?