[asterisk-users] Terrible clicking on T1

[Stephen Bosch]

Gleim, Jason wrote:
> I thought that might be an issue too... and it was originally. When we
> started out, I had the Sangoma card generating the timing for the span
> but we could never get the d-channel to come up. Turns out that since we
> were connected to the PSTN, we had to let the Nortel set the timing on
> the span because it was receiving the timing from the CO. (Essentially
> the timing needed to 'flow' away from the CO)
> 
> But, since we got that fixed and the span started working, I felt that
> timing wasn't the source of the problem. Plus, if we dump the error
> counters on both ends, they are not incrementing... even if the span is
> up for several days and we clearly have the audio problems. The slip
> counters, framing error, etc all stay at 0 and you would figure that if
> it was timing slip, those would be incrementing on at least one of the
> sides.

Okay -- if it's not clock slip (also my first inclination):

Your observation that the problem goes away after the card is disabled
and re-enabled, then returns after the maintenance routine runs, is a
major clue.

Here's what you need to find out:

-Where does the card get its configuration at start time?
-What is in that configuration?
-What procedures does the maintenance routine perform?

In this case, you want as much detail as you can get. Talk to Nortel if
necessary.

As an experiment -- can you disable the maintenance routine entirely? If
so, do it -- see whether the problem "remains gone" the following day.
You want to confirm that it's that routine that is causing the change,
and not something else.

-Stephen-