Re: [(ASCEND) PRI does not fill up after reboot]

[Bob K <melange@yip.org>]

> > Need to find out if the call even reaches the modem
> > in the MAX (when the problem occurs ie after the
> > normal/abnormal reboot). If you dial in with analog
> > phone do you hear the modem negotiation tone. Basically
> > we need to find out if the call is getting terminated
> > at the switch or at the MAX. If at the MAX then disconnect
> 
> At the switch. The Max never sees the call.
> 
> I'm not too familiar with ISDN messaging, but I assume there's some kind
> of reinitialization message that goes across the D channel when it comes
> up after reboot. What if the switch doesn't see that message and is
> unaware that the Max has reset, and some channels are thus made unavailable
> because they had calls on them before the reboot occured, and the switch
> thinks they are still in use?
> 
> This is probably a switch/Max incompatibility bug.
> 
> I'm just trying to find out if anyone else sees this with a DMS 100
> (or without?) If I'm alone then maybe it's just a switch configuration
> issue (I have no idea what a DMS config looks like!)

Actually, I've seen similar behaviour in a MAX4004 with 4 T1's, 3 being
PRI from one telco, and 1 was AMI/CT1 from another - turns out there were
clocking issues that was causing all sorts of bizarre behaviour (not to
mention that the box was overloaded, which probably excaberated the
problem). Calls would make it to the MAX according to the telco, but the
MAX would refuse them without any indication in the status windows that a
call was coming in; the user would hear a slight pause when dialling in,
followed by a fast busy.  Solution? We moved the CT1 onto a different box.
Next time it happens, perhaps you could try unplugging the T1's one at a
time to move the clock source around (use the diagnostics clocks command
to see what source is being used) - when you start getting refused calls,
you'll know you've got the right one.

This is an extremely painful process, especially when the box in question
is a dedicated ISDN box, not to mention time-consuming.  I'd use it as a
last resort (especially since the problem may lie somewhere else).

melange@yip.org - Mustard gas: The kids love it!

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