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Pre-Mapping Option A (DHCP) Alice DHCP Server Registrar Mapping Server [M1] DHCP DISCOVER (IP add, Subnet, Default GW, etc) ----------------> [M2] DHCP OFFER <---------------- [M3] DHCP REQUEST or INFORM (Location, PSAP-URI) ----------------> [M4] ECRIT Protocol Query (contains Location) -----------------------------------------> [M5] ECRIT Protocol Response (contains PSAP-URI) <----------------------------------------- [M6] DHCP ACK (contains location & PSAP-URI) <---------------- Emergency Call set-up initiated -----------..........------------.....--> described in draft-polk-dhc-uri-03 |