1. On some implementation of radius, if a persistent login with same
invalid username and password, the radius server would log off the
connection and deactivate the username. Once the user tries to log back
on with the same user name, radius server terminates the call.
2. Sending reject message to PM3 that actually disconnects the call.
(yes, I try to dial to a IEA dialup number and I can stay on line
forever by constantly supplying username and password).