Basic routing query and call routing Emergency Services

Basic – routing query and call routing Emergency Services Provider Network Vo. IP domain Call server V 4 2. Call-Init( Loc -Client-ID, [LISID], [LOC], [e. LGW] ) User Agent V 1 7. Call route ESGW E 9 -1 -1 Selective Router 3. Query (Client-ID, [LIS-ID], [LOC], Call. Back*, Provider ID) 6. Response with ESQK SRDB ALI DB V 2 1. LIS-ID, [LO], [e. LGW] VPC V 0 V 3 5. PLR(Client-ID) 5 a PLResp(LO) LIS DBMS 4. NSLU( LIS-ID) DHCP DNS MSAG PSAP

Proxy Redirect – proxy performs routing query Vo. IP domain Emergency Services Provider Network Call server V 4 2. Call-Init( Loc -Client-ID, [LISID], [LOC], [e. LGW] ) V 5 9. Call route Redirect Proxy 3. Invite 8. Redirect E 9 -1 -1 ESGW Selective Router 4. Query (Client-ID, [LIS-ID], [LOC], Call. Back*, Provider ID) 7. Response with ESQK V 1 User Agent SRDB ALI DB V 2 1. LIS-ID, [LO], [e. LGW] VPC V 0 V 3 6. PLR(Client-ID) 6 a PLResp(LO) LIS DBMS 5. NSLU( LIS-ID) DHCP DNS MSAG PSAP

Proxy route – proxy performs query and route Vo. IP domain Call server 3. Invite 2. Call-Init( Loc -Client-ID, [LISID], [LOC], [e. LGW] ) 8. Call route E 9 -1 -1 ESGW Selective Router V 4 V 2 V 1 User Agent 1. LIS-ID, [LO], [e. LGW] Routing Proxy V 5 Emergency Services Provider Network 4. Query (Client-ID, [LIS-ID], [LOC], Call. Back*, Provider ID) 7. Response with ESQK SRDB ALI DB V 0 VPC V 3 6. PLR(Client-ID) 6 a PLResp(LO) LIS DBMS 5. NSLU( LIS-ID) DHCP DNS MSAG PSAP