:
:>:
:>:Well lets say I am at work, and my alarm system goes off, it will
:>:trigger the dialer. First, I will see on my phone that someone is
:>:calling me from home from the call display. Then if I hear a
:>:continuous dial tone for 20 seconds, then I will know my alarm is on.
:>:
:>:K
:>
:>
:>You've lost me....
:>
:>Your alarm at home triggers and dials your work number. You see on yourCLI
:>display at work that the calling number is your home. Then you hear 20 seconds
:>of dial tone so you will know your alarm is "ON"....??????? (scratches head in
:>wonderment).
:>
:>BTW, don't you mean, "you will know your home alarm has been triggered"?
:>
:>Where is the 20 seconds of dial tone coming from? And why dial tone?
:>
:>I suggest you start out with something like this project and refine it if
:>necessary.
:>
http://users.tpg.com.au/users/talking/DialAlarm-1-Page1.html
:
:Haven't looked at your link yet, but this is an easy one. Since the
:human is in control of the situation on the receive end, answer the
hone and press #99 or some other acknowledging code, and the
:auto-dialer can respond in whatever way it's been programmed. A whole
:series of DTMF communication may be programmed, depending on the
:sophistication of the auto-dialer apparatus.
:
:Of course, the assumption remains that the receiving human knows that
:the alarm has triggered from the mere fact that home is calling, and
resumably is not the wife asking to have a loaf of bread or jar of
ickles picked up on the way home. Unless there is something
:tangible that gives value to the receiver communicating with the
:auto-dialer, there is no need for anything more than caller-ID at the
:receiving end.
I know the human at the receive end controls the situation and that he can
respond to the call using dtmf. But when he does this why would the sending end
respond with dial tone? This would require the generation of 2 tones which are
not part of the dtmf frequency plan. Ok, not hard to do in software, but it
seems unneccesary. Why not respond with one of the standard dtmf tones instead
of dial tone?
Out here dial tone is 400Hz + 425Hz afaik.