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From: kitty!larry@uunet.uu.net (Larry Lippman)
Newsgroups: comp.dcom.telecom
Subject: Ringback Tone Variations
Message-ID: <10489@accuvax.nwu.edu>
Date: 6 Aug 90 03:54:55 GMT
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X-Telecom-Digest: Volume 10, Issue 544, Message 5 of 11


In article <10349@accuvax.nwu.edu> david@cs.uow.edu.au (David E A
Wilson) writes:

> Here in Australia, I have noticed that with my parents phone, the ring
> sound that the caller gets depends on the phone plugged into the
> socket (phones that chirp and phones that ring a bell sound different
> to the caller).

> Would this tend to indicate the vintage of their exchange?

	Yup.  It is old *and* electromechanical.  In BOC areas, there
is still No. 1 XBAR and SxS in service which have unmodified
intraoffice trunks which obtain ringback tone from the superimposed
ringing supply.  Listening to a call placed to a party with some
electronic ringers will result in a distinctive sound from spurious
oscillations created by the ringer circuit.


Larry Lippman @ Recognition Research Corp.  "Have you hugged your cat today?"
     {boulder||decvax||rutgers||watmath}!acsu.buffalo.edu!kitty!larry
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