"David Hutto" <smokefl...@gmail.com> wrote
By flow through, I mean that the phone has one of 2 states(on the
hook, off the hook), and three sub states(on the hook/off the hook
in
use/off the hook not in use).
Umm, no. Much more than that.
On the actual phone we pick up the receiver, or press the button on
the cordless to receive, but the line is always connected, meaning
it
stops at the phone(terminal). I pick up the receiver, and transmit a
series of specific tones which indicate the area code, trunk number
and extension(if I remember this correctly, it's been a while since
I
studied the phone itself).
You are describing an anlalog phone but with a greatly oversimplified
model. (no dialtone/busy tone/party-line detection etc)
You need to do a lot more research into how analog phones work and
you will need some hardware to interface to it - weither a dedicated
CTI card or a modem.
So I think my main question is what modules might be relevant to
doing
this? And should I be thinking of it any differently than a USB port
which has 4 pins two data(+-), and two dc current(+-)?
USB is a digital serial bus, phones are analog. They are not at all
alike (quite apart from the voltage issues Bob mentioned).
--
Alan Gauld
Author of the Learn to Program web site
http://www.alan-g.me.uk/
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