Asterisk 1.8 – BRI D Channel going up and down every few seconds

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Asterisk Users 2 Comments

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!

2 thoughts on - Asterisk 1.8 – BRI D Channel going up and down every few seconds

  • 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