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From: gil@limbic.ssdl.com (Gil Kloepfer Jr.)
Newsgroups: comp.dcom.telecom
Subject: Centel PBX - Strange Codes?
Message-ID: <14463@accuvax.nwu.edu>
Date: 6 Nov 90 14:57:20 GMT
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In regard to strange codes from PBX stations: At the office, we have a
Centel PBX system.  I'm wondering if anyone can pass along what the
following means:

If I dial '87' on the phone, I get a second dial tone.  This isn't the
same as dialling '9' for an outside line -- it also sounds like a
standard dial tone.  However, it performs some funky dialing depending
on what I do.  For example -- if I dial NNX-YYYY-111-1111 it seems to
dial the standard NNX-YYYY -- but I do need to dial the 7 ones after
it.

Even more interesting still, if I dial '87*', I get a **LOUD** rushing
noise which sounds similar to a combination of a 2400 baud modem
tones, and Telebit PEP noises.  Pressing any touch-tone key at this
point temporarily termninates the noise, and gives me a dial tone
which lets me do nothing.  Could this be the trunk access code?  What
happens if you plug an analog phone onto a T1 trunk?

Last bit of information, and something which I would like clarified a
little -- we have a whole block of numbers from the local telco, which
I assume is a DID arrangement.  Of course, we'd need to be able to
program the PBX switch to handle the direction of each number in this
range.  I'm assuming that this is all handled by some signalling from
the CO.  How is this transmitted to the PBX (in-band, or some kind of
digital signalling?)

My apologies for the length of this, but I think that although the
information will be specific to this PBX, everyone else will learn
from the concepts involved.


Gil Kloepfer, Jr.              gil@limbic.ssdl.com   ...!ames!limbic!gil 
Southwest Systems Development Labs (Div of ICUS)   Houston, Texas