Finite State Machine (FSM) Framework for SIP Extensions
This draft defines a Finite State Machine (FSM) Framework for the SIP Extensions using which various SIP extensions, having their unique definitions of a SIP transaction or a Dialog, can be implemented in a scalable manner, while keeping the logical meaning of a dialog or a transaction (as defined by RFC 3261 [1]) intact. This draft proposes a set of guidelines for implementing FSM in various SIP extensions.