[asterisk-users] British Telecom ISDN BRI line issues

[Patrick Lists]

On 10-05-12 21:10, khalid touati wrote:
> Hi All,
> I did downgrade to asterisk 1.6.2.6 and dahdi 2.3 which is working with
> other BRI line (in our NL office), but I get this type of errores:
> 
>     -- Called G1/0788744550
> [May 10 20:07:20] ERROR[27479]: chan_dahdi.c:12280 dahdi_pri_error: ACK
> received for '1' outside of window of '0' to '0', restarting
>   == Primary D-Channel on span 3 down
> [May 10 20:07:20] WARNING[27479]: chan_dahdi.c:4158 pri_find_dchan: No
> D-channels available!  Using Primary channel 9 as D-channel anyway!
>   == Primary D-Channel on span 3 up
> [May 10 20:07:20] ERROR[27480]: chan_dahdi.c:12280 dahdi_pri_error:
> Huh!? no master found
> 
> I didn't change my config in my previous post, anyone familiar with this
> type of errors?

No but there is a bug report with a lot of information that seems
similar: https://issues.asterisk.org/jira/browse/14031

In Europe telco's drop the D-channel (cut off power) to save on the
electric bill. The libpri/dahdi/asterisk combo should detect a dropped
D-channel and signal the telco to fire up the D-channel. Judging from
that bugreport ("Unresolved") it seems Digium has still not succeeded in
properly handling this situation.

Should you not be able to resolve this issue and really require an ISDN
BRI connection then have a look at an Eicon Diva or Sangoma card. Both
cards+drivers properly handle a dropped D-channel. I have used Eicon
Diva and Sangoma BRI cards in the Netherlands and they work fine. Or you
could get a blackbox from Beronet, Patton, Audiocodes etc. If you feel
adventurous you can also get a BRI card with a HFC-S Cologne chipset and
get the latest and greatest isdn4k-utils, mISDN, mISDNuser and lcr from
http://misdn.eu, build, install and configure lcr to talk to asterisk. A
few weeks ago I set it up and did one test call and that call worked
fine. Use at own risk :)

Regards,
Patrick