[asterisk-users] Asterisk 1.8 - BRI D Channel going up and down every few seconds

[Patrick Lists]

On 03-01-12 11:22, Marco Mooijekind wrote:
> Dear all,
>
> I have the following challenge using Asterisk 1.8, using a Digium B410P
> card on BRI (The Netherlands, KPN ISDN) .
>
> DAHDI is running, dahdi_tools indicates OK on my span and light on back
> of card is green.
>
> However, in Asterisk i get the following warnings every few seconds:
>
> [Jan  2 20:33:17]   == Primary D-Channel on span 1 up
> [Jan  2 20:33:26]   == Primary D-Channel on span 1 down
> [Jan  2 20:33:26] WARNING[1671]: sig_pri.c:1095 pri_find_dchan: Span 1:
> D-channel is down!
> [Jan  2 20:33:27]   == Primary D-Channel on span 1 up
> [Jan  2 20:33:37]   == Primary D-Channel on span 1 down
> [Jan  2 20:33:37] WARNING[1671]: sig_pri.c:1095 pri_find_dchan: Span 1:
> D-channel is down!
> [Jan  2 20:33:38]   == Primary D-Channel on span 1 up
> [Jan  2 20:33:47]   == Primary D-Channel on span 1 down
> [Jan  2 20:33:47] WARNING[1671]: sig_pri.c:1095 pri_find_dchan: Span 1:
> D-channel is down!
> [Jan  2 20:33:48]   == Primary D-Channel on span 1 up
>
> Result is I cannot dial out or in into Asterisk.
>
> The asterisk module states the D Channel is going up and down every few
> seconds. Some googling on Asterisk, BRI, and this warning indicates that
> there might be an issue with Aterisk 1.8.x and euro BRI, version of
> LibPRI etc.
> has anybody experienced these problems on BRI? Any suggestions with
> regards to these warnings are welcome!

The telco (KPN) switches the D-Channel off to save electricity. An 
endpoint should be able to handle this gracefully. It should just 
request that the D-Channel be activated again and once the telco 
complies the endpoint can then continue with setting up a call. Last 
time I looked dahdi/libpri/asterisk did not handle this very well. 
Admittedly that was quite a while ago and I do not know the current 
status. The bugreport were this was discussed and still seems to be 
unresolved can be found at:
https://issues.asterisk.org/jira/browse/ASTERISK-13176

Don't know if you have seen it but there's an B410P installation doc at:
http://docs.digium.com/B410P/b410p-user-manual.pdf

Since you bought a B410P you should be able to get support so just call 
Digium. Good luck. Look forward to hear how it goes so please update the 
list.

Regards,
Patrick