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From: jackson@ttidcc.tti.com (Dick Jackson)
Newsgroups: comp.dcom.telecom
Subject: Help Wanted With Four-Wire Phone
Message-ID: <16197@accuvax.nwu.edu>
Date: 18 Jan 91 19:22:17 GMT
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X-Telecom-Digest: Volume 11, Issue 49, Message 7 of 11


We have an echo cancellation system along with our compressed video
gear that provides audio via a power amp and speaker.  We want to add,
as an option, a handset capability.  The easiest way to do this, I
think, is to attach a four-wire telephone via a matching transformer
(10:1?). Note: we have to work from the existing system because it
provides a delay which provides lip sync with the video.

I would appreciate information about whether regular telephones are
available with a four-wire interface (not operator headsets) and
pointers to vendors.


Thanks in advance,

Dick Jackson