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From: ruck@reef.cis.ufl.edu (John Ruckstuhl)
Newsgroups: comp.dcom.telecom
Subject: Re: Detecting the End of an Incoming Call
Message-ID: <16248@accuvax.nwu.edu>
Date: 21 Jan 91 08:42:12 GMT
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X-Telecom-Digest: Volume 11, Issue 43, Message 7 of 12


In article <16083@accuvax.nwu.edu> abm88@ecs.soton.ac.uk (Morley A.B.)
writes:

>Does anyone know how I go about detecting the end of an *incoming*
>call on an ordinary residential line?  I thought I once read that
>the voltage changes or someting.  I am in the UK.

My answering machine (a Sony ITA-500) cannot reliably detect the end
of an incoming call on an ordinary residential line.  My previous
answering machine (a PhoneMate) had the same problem, and I always
blamed the machine until I saw the problem on the new answering
machine.  The problem causes great confusion, sometimes leaving the
machine in an error state which might cause lost messages :(

A Southern Bell serviceman visited, and said my line was as clean as
they get!  I explained my problem, but he couldn't help me.

BTW, I did my simple inside wiring -- 30' of two pair from the inside
block dead-ending at the jack for the answering machine, and another
20' of 2pr from the inside block to a dead-end with a jack.

What should be my next step?

(Also, has anyone converted a Sony ITA-500 to an ITA-600?  The 600 is
a "speaker-phone"; the 500 just has "on-hook dialing")

Thank you for your help.

Best Regards,

John R Ruckstuhl, Jr   University of Florida  ruck@cis.ufl.edu, uflorida!ruck