[asterisk-users] DAHDI Error

[Eric Wieling]

> -----Original Message-----
> From: asterisk-users-bounces at lists.digium.com
> [mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of
> deeps backup
> Sent: Friday, May 13, 2011 9:02 AM
> To: asterisk-users at lists.digium.com
> Subject: [asterisk-users] DAHDI Error
>
> Hi,
>
>
>
> Sometimes calls on Asterisk fail to connect to DAHDI channels
> and giving below error:
>
> Unable to create channel of type 'DAHDI' (cause 34 -
> Circuit/channel congestion)
>
>
>
> There are 8 E1 connected on server and only 15-20
> simultaneous calls. All channels and E1 are showing in
> service without any alarms.
>
>
>
> Could anyone please let me know why this is happening?
>

The message is likely coming from the telco or from the destination number.  It is a common issue.  I usually put something in my dialplan to retry all calls that receive an unexpected hangup cause to work around the telco seemingly randomly sending back odd hangup causes.   You should not retry ALL calls, only ones with unexpected hangup causes.