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Assumed Generic Emergency Call Alice DHCP ESRP Mapping Server PSAP [M1] DHCP DISCOVER (IP add, etc) ----------> [M2] DHCP OFFER <--------- (Could be another Protocol) [M3] DHCP REQUEST or INFORM (Location) ----------> [M4] DHCP ACK (includes location) <--------- [M5] INVITE (sos, PIDF-LO) ---------------------> [M6] ECRIT Query -----------------> [M7] ECRIT Response <----------------- [M8] INVITE (Request-URI to PSAP) --------------------------------------> [M9] 200 OK <-------------------------------------------------------------- [M10] ACK --------------------------------------------------------------> Session Established <=============================================================> |