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telephone handsfree switch generate by sound


 

Dear all,
I'm a new member here. Nice to join E_101.
I have a problem. I work in IT field, exactly in O&M server machines.
Since my server often has trouble in application software, I intend
to make an alarm system when trouble occurs. I have made a software
that could play a *.wav file (a 1 minute song) in my PC at the time
when trouble occurs. I wish I could make a hardware (connect from PC
speaker to a phone) that able to call my home phone number at that
time. The concept is: while my PC speaker plays a song, the signal
will generate the hardware to switch the phone's handsfree on. Then,
since my office phone has a "hotline delay" feature, it will
automatically call my home number. And when the song finished, the
handsfree will off again.
Could anybody here help me to describe the circuit of this kind of
hardware? Thanx for your kind attention.
Regards,
Enrico

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