Nortel Networks Norstar 4.0 w/ applications mod 4.0.07a

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Norstar 4.0 w/ applications mod 4.0.07a qwiksting 05-09-05
Posted by qwiksting on May 9, 2005, 10:00 pm
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Having a problem with the auto attendant releasing a call once the
caller hangs up..i.e. caller listens to info mailbox...or caller
realizing he called the wrong number and hanging up, however, the auto
attendant rings the attendant phone. Phantom caller. I have played
around with supervisor disconnect and set it at all levels testing it,
however no joy. Any help would be appreciated.

smitty



Posted by Bob on May 10, 2005, 2:33 am
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It might (probably is!) be a telco problem. Verify that the KSU is detecting
the CPC pulse (disconnect signal) properly. Call in on a line, and while the
auto attendant is talking, open one side of the line going into the key
system. The system should drop the call instantly. If it does, and it
doesn't drop when you (the caller) hang up, the telco is not sending the CPC
pulse. This basically is the absence of loop current for somewhere around
700 milliseconds when the calling / called party hangs up. It is a standard
feature on public CO switches like Lucent 5ESS, NT DMS, etc. It is
configurable on a per line basis, but it can be messed up if your line comes
from a SLC, or certain types of remotes. All this assumes that your KSU is
connected directly to a public CO. If you are actually getting your lines
from a PBX, the standard linecards do not provide CPC. Some PBXs can provide
this, but may need a different line card.
Look at the bottom left of this page: http://www.sandman.com/pdf/Page47.pdf
For maybe a better explanation, see: http://www.sandman.com/cpcbull.html



> Having a problem with the auto attendant releasing a call once the
> caller hangs up..i.e. caller listens to info mailbox...or caller
> realizing he called the wrong number and hanging up, however, the auto
> attendant rings the attendant phone. Phantom caller. I have played
> around with supervisor disconnect and set it at all levels testing it,
> however no joy. Any help would be appreciated.
>
> smitty
>




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