[asterisk-dev] On PRIs, blocked channels, congestiona and telco technicians

Edwin Groothuis edwin at mavetju.org
Thu May 29 23:22:12 CDT 2008

On Fri, May 30, 2008 at 12:20:43AM +1000, Edwin Groothuis wrote:
> It has been discussed before here, unfortunately without result or
> outcome.
> The issue? After about two months of operation, all 31 channels of
> our PRI bcome, according to our telco, in a "blocked" state. What
> that precisely means I am not really sure of, but all my SETUP PDUs
> are answered with a RELEASE COMPLETE PDU:

That was an useful discussion: After being transfered to a senior
technician (which is always better than the one who is outsmarted
by your own knowledge about the telephone system :-) he said that
the channels are in the backwards busy state.

Why that happens? He said it happens when the hourly resetting of
the channels is going wrong.

How wrong? He says it happens when the restart message is answered
too late (i.e. before the next restart message) or with the wrong
data (reset of channel 0/1 is completed while reset of channel 0/2
is expected).

As suggested, I will do some traces on it during the night and see
if I can find blocked channels.


Edwin Groothuis      |            Personal website: http://www.mavetju.org
edwin at mavetju.org    |              Weblog: http://www.mavetju.org/weblog/

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