Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!samsung!sdd.hp.com!wuarchive!julius.cs.uiuc.edu!apple!bionet!hayes.ims.alaska.edu!accuvax.nwu.edu!nucsrl!telecom-request
From: zweig@cs.uiuc.edu (Johnny Zweig)
Newsgroups: comp.dcom.telecom
Subject: Hangup Indication
Message-ID: <14947@accuvax.nwu.edu>
Date: 25 Nov 90 23:49:27 GMT
Sender: news@accuvax.nwu.edu
Reply-To: zweig@cs.uiuc.edu
Organization: U of Illinois, Dept. of Computer Science, Systems Research Group
Lines: 16
Approved: Telecom@eecs.nwu.edu
X-Submissions-To: telecom@eecs.nwu.edu
X-Administrivia-To: telecom-request@eecs.nwu.edu
X-Telecom-Digest: Volume 10, Issue 845, Message 9 of 14


I was just listening to the seventeenth message in a row on my
answering machine that says "If you would like to make a call, please
hang up and try it again" and got to thinking: for POTS, what
indicator is there that the party on the other end of a connection has
hung up?  Is it just the dialtone(*), or is there some other kind of
signal (line-voltage, say) that lets you know?  I understand that ISDN
will have hang-up messages on the D-channel, so maybe I should just
rush out and buy one of the ISDN answering machines I've been seeing
all those ads for.


Johnny Curious

(*) followed by silence followed by the stupid announcement followed by that
loud beeping followed by more silence