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Euphoric Recovery from Mapping Failure Alice DHCP ESRP Mapping Server PSAP [M1] DHCP DISCOVER (IP add, etc) ----------> [M2] DHCP OFFER <--------- [M3] DHCP REQUEST or INFORM (Location, ?) ----------> [M6] DHCP ACK <--------- [M7] INVITE (sos, PIDF-LO & early Mapping URI) ---------------------> [M6] ECRIT Protocol -----------------> [M7] Map Failure <----------------- [M8] INVITE (fallback of Route header) --------------------------------------> [M9] 200 OK <-------------------------------------------------------------- [M10] ACK --------------------------------------------------------------> Session Established <=============================================================> |