After closing the ppp connection to the internet The phone line is still occupied. In fact, ofted I tried to use the phone to call a friend and I realised that the line was still occupied. Who knows how much I have been charged from Greek Telecommunications due to this bug....
Upgrade initscripts to the latest RawHide and see if that fixes the problem.
Fixed for certain in initscripts-4.47 and later -- the ppp-watch daemon now grabs the modem and hangs it up even if pppd or the dialer somehow forgot...