asterisk users - Jul 2009 - OT - Do analog gateways detect a phone is plugged in or out ?

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.

Regards
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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