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3. Race condition
3.1 Receiving message in the Moratorium State
3.1.1 Receiving Initial INVITE retransmission(Trying state)
3.1.2 Receiving CANCEL(Trying state)
3.1.3 Receiving CANCEL(Trying state) via a stateful proxy
3.1.4 Receiving BYE (Early state)
3.1.5 Receiving re-INVITE (Established state)
3.1.6 Receiving BYE (Established state)

3.2 Receiving message in the Mortal State
3.2.1 Receiving BYE(Established state)
3.2.2 Receiving re-INVITE(Established state)
3.2.3 Receiving REFER(Established state)
3.2.4 Receiving 200OK for re-INVITE(Established state)
3.2.5 Receiving ACK (Moratorium state)

3.3 other race condition
PPT Version