Re: telephone circuit
- From: lerameur <lerameur@xxxxxxxxx>
- Date: Tue, 2 Sep 2008 14:26:07 -0700 (PDT)
On Sep 2, 5:15 pm, John Fields <jfie...@xxxxxxxxxxxxxxxxxxxxx> wrote:
On Tue, 2 Sep 2008 12:16:36 -0700 (PDT), lerameur <leram...@xxxxxxxxx>
wrote:
Hello,
I am using a pic controller for a dialer project. My goal is to dial
a number, when the receiving end picks up, then send some dtmf tone
for a few minutes.
Sounds simple, but I do not know how to tell my controller that the
receiving end has picked up or not. Right now I just let it ring for
10 seconds, and send my dial tone after that. I would like it to be
more 'intelligent' by knowing when the receiver has picked up so I can
send the dial tone (message),
thanks
---
If you're going to use the remote phone for remote control purposes
you could have it shake hands with the controller:
LOCAL REMOTE
DIAL---------------------------->DETECT RING
WAIT FOR HANDSHAKE GO OFF-HOOK
RX HANDSHAKE <------------------ TX DTMF HANDSHAKE TONES
WAIT FOR DTMF DATA
TX DTMF DATA-------------------->RX DTMF DATA
JF
Yes but how is this handle in circuitry. I just realize that I cannot
use the same circuit with audio transformer as I did in DTMF to signal
out. How should the voltage at the line while dialing? and once the
party has pick up the phone ?
Ken
.
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