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Pre-Mapping Option B (SIP REG) Alice DHCP Server Registrar Mapping Server [M1] DHCP DISCOVER (IP add, Subnet, Default GW, etc) ----------------> [M2] DHCP OFFER <---------------- [M3] DHCP REQUEST or INFORM (Location) ----------------> [M4] DHCP ACK <---------------- [M5] REGISTER (PIDF-LO & Map Request) -------------------------------------> [M6] ECRIT Protocol Query (contains Location) -------------------> [M7] ECRIT Protocol Response (contains PSAP-URI) <------------------- [M8] 200 OK (PSAP URI) <------------------------------------- Emergency Call set-up initiated -----------..........------------.....--> described in draft-polk-ecrit-mapping-during-registration-00 |