Patent ID: 7969967

Claim:
An apparatus, comprising: a BGCF (Breakout Gateway Control Function) in an IMS (IP Multimedia Subsystem) network; a portability number query module in the BGCF; a portable range table operatively coupled to the portability number query module; a NPDB (Number Portability Database) operatively coupled to the portability number query module in the BGCF; and an ENUM DB (ENUM Database) operatively coupled to the portability number query module in the BGCF, wherein the BGCF processes all E.164 based calls of the apparatus, including IMS calls having E.164 numbers, by launching a query to the NPDB to retrieve a routing number of a call, checking digits of the call with the portability number query module, determining via NPDB if the E.164 number of the call is ported, obtaining a routing number if the E.164 number is routed, and checking via ENUM if the call can be routed over IP.