4. Service Provider Portability Schemes Orig. Old SP New SP 1 2 Number Porting All Call Query Orig. Donor SP New SP 3 4 Query on Release Orig. New SP 2 4 Dropback Onward Routing 1 2 release w/o # 1 3 release w/t # Orig. New SP 2 3 1 External or integrated External or integrated Centralized Centralized Old SP Number Porting Old SP Number Porting Donor SP Donor SP Old SP Number Porting DB DB DB DB
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7. IP & Telecoms Interworking Internet Old SW New SW Re-Association GWd1 Call orig. from SCN GWd2 GWo SIPo /GKo SIPd1 /GKd1 SIPd2 /GKd2 Number Porting GK - Gatekeeper GW - Gateway NP - Number Portability SCN - Switched Circuit Network SIP - Session Initiation Protocol SW - Switch o - Origination d - Destination NP Info. PictureTel PictureTel