Phones for Asterisk and single-pair old phone wiring?

[Michael Pelletier]

X.25?  Yikes.

Didn't my post about Westermo's old-copper ethernet bridge units make it out
to the list?

http://www.westermo.com/Resource.phx/content/uk/products/ethernet/ethernet-e
xtender/ddw-220.htx

It allows the use of crummy old telco twisted pair to deliver
lower-bandwidth ethernet up to 10km away, by bridging the ethernet ports to
SHDSL (Single-pair High-speed DSL).

So you just use standard ethernet phone sets at the desks, plug them into
the Westermo extenders, run 'em back to the datacenter over the antiquated
copper lines, then pull ethernet off of the other set of extenders in the
datacenter to go to the phone system ethernet VLAN.  The Westermo units are
web-configurable, and have SNMP.

Then your entire phone system can be uniform, rather than a lumbering
Frankenstein's monster limping along with analog sets in one half and
ethernet sets in the other.

Sure, the Westermo unit above will only push about 5.7Mb/s max over 1 3/4
miles of 24-gauge copper, but that's more than enough for a VoIP phoneset
with the DC in the same building.  Probably would be best to test and insure
that the jitter, latency, and whatnot are suitable for VoIP before jumping
in whole-hog, but it looks like a practical option.  Of course, it depends
on the Westermo extender pairs costing less than new wiring.

	-Michael Pelletier. 

-----Original Message-----
From: gnhlug-discuss-bounces at mail.gnhlug.org
[mailto:gnhlug-discuss-bounces at mail.gnhlug.org] On Behalf Of
VirginSnow at vfemail.net
Sent: Wednesday, September 03, 2008 8:39 PM
To: gnhlug-discuss at mail.gnhlug.org
Subject: Re: Phones for Asterisk and single-pair old phone wiring?

> Date: Wed, 3 Sep 2008 10:34:58 -0400
> From: "Ben Scott" <dragonhawk at gmail.com>

>   Anyone know of any kind of enhanced telephone set that can be 
> connected to an Asterisk-based system using plain old telephone phone 
> wiring?

You might also look into X.25.  It's a packet networking technology designed
to run over ordinary phone lines and (used to be?) common in office
settings.  Last I checked, Linux had an X.25 protocol stack.
If you could find any X.25 phones, you might be able to get them talking to
Asterisk over those crummy old 2-conductor phone lines.
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