3.1.7.4 PPP Termination
The PPP Termination event is indicated from the PPP to the CBCP. This event is used to denote the PPP termination. The PPP is being terminated because either a Callback will be received or the Termination Request ([RFC1661] section 3.7) was received or the overall PPP negotiation has not completed within a user- or administrator-configured time (for the PPP), or because some other external event such as link termination or link failure occurred. The CBCP will stop any active timers and clear up its state for the session. No active processing of received messages will occur beyond this event.