[asterisk-users] OT - Do analog gateways detect a phone is plugged in or out ?

[Steve Totaro]

On Wed, Jul 22, 2009 at 12:07 PM, Steve Underwood <steveu at coppice.org>wrote:

> Olivier wrote:
> > Hi,
> >
> > I've got a general question about analog gateways (Xorcom, Audiocodes,
> > Patton, ...) .
> > Is it usual for analog gateways to detect when an analog phone is
> > plugged in or out ?
> > If positive, would it be then useful to send "qualify" queries for
> > each connect phone (I'm implying here that an analog gateway would
> > then reply appropriately for qualify query.
> Unless there is a call in progress the switch has no idea what phones
> might be plugged or unplugged. Nothing happens on the line what it could
> detect.
>
> Steve
>
>
It certainly would seem "possible" and would be a great feature request.

There probably is no circuitry existing to do it, but I would assume that
ohms, volts, or something could be measured while sending a small amount of
voltage down the FXS lines.

A zero would indicate that nothing is attached, any other reading would
indicate either equipment or at the least, show that the circuit is not
open.

-- 
Thanks,
Steve Totaro
+18887771888 (Toll Free)
+12409381212 (Cell)
+12024369784 (Skype)
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