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The Telecom Digest for September 8, 2012
Volume 31 : Issue 213 : "text" Format
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Problem using modem with phone on T junction - when drop call on local analog phone, remote end not detecting disconnect (Angus)

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Date: Wed, 5 Sep 2012 14:43:45 -0700 (PDT) From: Angus <anguscomber@gmail.com> To: telecomdigestmoderator.remove-this@and-this-too.telecom-digest.org. Subject: Problem using modem with phone on T junction - when drop call on local analog phone, remote end not detecting disconnect Message-ID: <c441dffa-343d-4611-850d-220e2604707a@googlegroups.com> Hello I have a normal analog phone and a modem going into a telephone T junction and then into master socket to exchange. The reason for this is I have problem collecting the Caller ID from the serial port of the modem. The modem is not used for anything else. to answer the call I use the ordinary phone. Now the problem I have is that if I drop the call on my local phone the other end doesn't seem to get a disconnection indication? Their end just stays 'line' indefinitely. If they have eg digital handsfree telephones and don't drop their end they seem to stay 'live'. I tried a few things. I used ATH on the modem to drop the call - but this makes no difference. Any ideas why this would be happening? Could different wiring affect it? Any suggestions on how to send a disconnection 'indicator' to the other end? Angus
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