Good day...
FIrst, let me state my problem.

I have a linux RH7.0 acting as a gateway and works fine with my isp setup using a straight DUN connection. But when my isp offers a callback, I automatically jump into that offer cause that will save me money 'coz I'll just pay for the time when my computer dials, and wait for the callback from my isp.

The problem is, I don't know how to setup the call back to the Linux box. When it dials and starts to connect to my isp, it says the connection has been terminated.(Of course, because, my isp is supposed to call back to my number, it should disconnect the link first.)

Anybody who has an idea on how to setup RH7 to support the callback feature provided by my isp?

I am just playing around with dialup/dialback right now.
However mine is the other way round but I did notice a script called callback in my /usr/share/doc/packages/ppp/ in this script it details how to send signals to dial up and dial back.

Hope this helps.