Extra 3B1 Phone features?

[Ron Wilson]

In article <5131 at emory.mathcs.emory.edu>, km at mathcs.emory.edu (Ken Mandelberg) writes:
>phone program that allows:
>
>2) demon dialing: Redials a busy number until it answers.
>-- 
>Ken Mandelberg      | km at mathcs.emory.edu          PREFERRED

Demon dialing isn't really practical on the UNIX-PC internal dialer: the
internal dialer does NOT have busy detect - you end up listening to 30 secs
of the busy signal, then it times out (it assumes that you have picked up the
handset by then, and releases the line) - in theory, a program could check if
the handset was "off hook" when the dial(3) (or ioctl(2)) function returns
after dialing: if the handset was still "on hook," the program could redial.

But, as I said, the dialer doesn't have a busy tone detector, so it would
keep your phone line busy for 30 second intervals at whatever time period
you were retrying the number.