Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!bellcore!texbell!vector!telecom-gateway
From: chipcom.chipcom.com!eli@eecs.nwu.edu
Newsgroups: comp.dcom.telecom
Subject: Re: Strange Phone Problem
Message-ID: <telecom-v09i0183m06@vector.dallas.tx.us>
Date: 1 Jun 89 12:31:54 GMT
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X-TELECOM-Digest: volume 9, issue 183, message 6 of 10

Andrew Duane describes a problem with touch tones at his friends house...

the cause is probably a polarity change at the CO or somewhere else
along the line...  most modern phones can handle either polarity, but
some older models must be wired for the proper polarity.

you can probably fix the ATT phones by opening them up and reversing
the tip and ring leads (the only 2 wires that do anything).  this
task is easier said than done for some people...  i've messed up many
a phone by trying to change polarity.  (i'm color blind).


-- Steve Elias
-- (eli@spdcc.com) or (eli@chipcom.com)
-- voice mail: 617 239 9406  [this number will change in June]
-- work phone: 617 890 6844