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From: dave@westmark.westmark.com (Dave Levenson)
Newsgroups: comp.dcom.telecom
Subject: Re: Leaving Brief Messages With Free Collect Calls
Message-ID: <12338@accuvax.nwu.edu>
Date: 19 Sep 90 01:40:49 GMT
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X-Telecom-Digest: Volume 10, Issue 658, Message 3 of 8


In article <12181@accuvax.nwu.edu>, motcid!ellisndh@uunet.uu.net (Dell
H. Ellison) writes:

> The ringback tone is just put there to let you know that the phone is
> actually ringing on the other end.  When you hear a 'ring', it
> probably is not at the same time that it is ringing on the other end.
> I don't know how people supposedly send messages by letting the phone
> ring a certain number of times.

What you say is certainly true today, in most electronic switches.  It
was not always true.  In the #5 Crossbar and most earlier
electromechanical switches, the ringback tone is synchronized with the
actual ringing applied to the calling party's line.  These stories are
probably history from a few years to a couple of decades ago. 


Dave Levenson			Voice: 908 647 0900 Fax: 908 647 6857
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