Patent ID: 7061894

Claim:
A registration method for providing voice communications between a wireless communication device and an end terminal in a packet data network, comprising: performing a location update of the wireless communication device; authenticating the identity of the wireless communication device; performing a ciphering procedure for the wireless communication device; notifying a Voice-over-Internet-Protocol Mobile Switching Center (“VMSC”) of the registration of the wireless communication device, the VMSC communicating with the wireless communication device through a circuit-switched network and communicating with the end terminal through a packet-switched network; activating a communication between the VMSC and the packet data network; performing a registration of the wireless communication device to the packet data network; and notifying the wireless communication device of the completion of location update, wherein an activation of the communication between the VMSC and the packet data network comprises: initiating a new Packet Data Protocol (“PDP”) context by the VMSC; establishing a record for the wireless communication device by a Gateway General Packet Radio Service (“GPRS”) Support Node (“GGSN”), the GGSN communicating with the packet data network through a gatekeeper (“GK”) and with the VMSC through a supporting Serving GPRS Support Node (“SGSN”); and enabling an Internet-Protocol communication between the GK and the VMSC.