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At Fri, 05 Oct 2007 17:14:04 -0400, I wrote:
Subject: Re: virtualization and a SCO openserver on NetBSD? vmware3?
>=20
> If I'm not mistaken even the fancy AT&T desk sets can be made to work on
> a simple analog line.  Don't quote me on that though :-) (I say this
> because I've seen many phone systems which do this by running the analog
> line along with control lines in a multi-pair connector, and the Merlin
> uses a multi-pair connector, and I seem to remember that during power
> outages the phones on the Merlin were all connected by default to the
> main line -- it certainly had lots of relays that clicked when the power
> was turned on or off.)

Mostly confirmed:

	+ Separate Pair per Function.  The early electronic
	  phones used a separate pair for each of the three
	  functions, and thus required three (or more) pairs.
	  The AT&T Merlin system used this design.  The
	  center pair is the audio; another pair is for the serially
	  transmitted control and display data and another han-
	  dles the phone's power requirements

	from:

		http://www.telos-systems.com/techtalk/3-10.pdf

I don't think the phones need power to be plain old telephones.

> Of course you would forgo all the fancy features on the phone sets --
> they'd all be replaced by special DTMF sequences (eg. dial "*98" to get
> to voicemail).

--=20
						Greg A. Woods
						Planix, Inc.

<woods@planix.com>     +1 416 489-5852 x122     http://www.planix.com/

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