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Failure scenario from SIP perspective Alice DHCP ESRP Mapping Server PSAP [M1] DHCP DISCOVER (IP add, etc) ----------> [M2] DHCP OFFER <--------- [M3] DHCP REQUEST or INFORM (Option 123, URI Option) ----------> [M4] DHCP ACK <--------- [M5] INVITE (sos, PIDF-LO) ---------------------> [M6] ECRIT Protocol -----------------> [M7] Map Failure <----------------- [M8] 4XX (New Mapping Failure) <----------------------- [M9] ACK ---------------------> If Alice's UA received this new 4XX Mapping Failure response, how would it react? |