All,
You need to go off hook, i.w. draw a specific
amount of current from the central office to have dial tone connected to
your line. I suspect the modem needs to mechanically connect to the
line (via a relay)
in this case to start the current draw and get the dial tone applied,
and then
"listen" to the line to see if the line is in use.
You may have to get another modem that is less intrusive in the way it
connects to the line
(i.e. non-mechanical) to avoid the click, but it still needs to sample
the line
to detect if other phones are off hook.
If you were handy, you might be able to rig up a circuit to do this
outside your modem,
but there are another set of issues around that...
my 0.02$,
MAC
On 14-Jan-08, at 12:17 AM, Fulko Hew wrote:
On Jan 13, 2008 3:13 PM, Daniel Allen <[EMAIL PROTECTED]> wrote:
I have a POTS line that is shared between a regular phone and a
modem.
If the modem attempts to dial out when the phone's off the hook,
there's an audible click as the modem checks the line, sees it's in
use, and hangs up.
How should I do this without the audible click? Is there an obscure
(or just obscure to me) Hayes command to test the line without
bringing the modem off the hook? Or do I want to try (yet another)
different modem?
ISTR that the modems simply go off-hook to listen for the dial tone.
I don't know of any modem that listens for dial tone without going
off-hook, especially since on an inactive line, its the process
of going off hook that signals the CO to apply dial tone.
Disclaimer: I am not a POTS expert.
Mike Campbell, P.Eng.
Brampton, ON
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