If your user PC is configured to dial with standard Windows dialer which is configured to do ppp negotiation there is not a way to send a message or greeting to the user when the dial in. If the user PC is configured to use post terminal dial window where they dial to the AS5300, authenticate, and then they enter the ppp command, then there is a way to send a message or greeting. I have done this very well at a customer site using the banner exec command to define the message. It works quite well and the message is displayed on the user screen.
HTH
Rick
HTH
Rick