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
5.
6.
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
![[object Object],[object Object],[object Object],[object Object]](https://image.slidesharecdn.com/ipw-12rev1-110206112102-phpapp01/85/Ipw-12-rev1-1-320.jpg)
![Number Portability ,[object Object],[object Object],[object Object],[object Object]](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)