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From: sba8_ltd@uhura.cc.rochester.edu (Scott Barnes)
Newsgroups: comp.dcom.telecom
Subject: AT&T Modem Calls Succeed; Other Carriers Fail
Message-ID: <14182@accuvax.nwu.edu>
Date: 31 Oct 90 00:19:17 GMT
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X-Telecom-Digest: Volume 10, Issue 778, Message 13 of 16


Over the past few months, I have been unable to place modem calls
using Least Cost Route (LCR) long distance on our Rolm CBX 9000 PBX.
The calls do complete, but the local and remote modems usually refuse
to handshake.

This probably sounds like a typical modem failure, but there is a
twist to the problem.  Explicit AT&T credit card modem calls are
successful, as are local calls.  I have duplicated this situation
several times using different modems.  The problem seems to lie
somewhere outside the Rolm system, but I have been unable to put my
finger on it.

Is is possible that one of the LCR carriers has an entire rack of
faulty equipment (i.e., distorting the frequency of the call)?  Would
the LCR trunks be distinct from AT&T and local trunks in the Rolm
system?  Any clues or assistance would be appreciated, as I would like
to know what I'm talking about before I report this problem.


Scott Barnes
University of Rochester
sba8_ltd@uhura.cc.rochester.edu