Dialer detecting end user hookup

[Bruce]

I have not looked at or used any of these code examples, but they do show how to detect
off-hook conditions and a lot more. Just figured you could find something useful in there
somewhere.

[ardhuru]

In the old days, the voltage polarity on the line used to flip when the called party lifted the phone; very easy to detect using an opto. Havent tested if this is still the case for a long time.

Regards,

Anand