Patent ID: 8811282

Claim:
A method of routing a call request from a Mobile Switching Center emulation (MSCe) in a wireless network to an Internet Protocol Multimedia Subsystem (IMS) network associated with the wireless network, the IMS network including a first entry point and a second entry point, the call request being related to a subscriber in the wireless network, the subscriber being assigned a Mobile Directory Number (MDN) that is homed on the MSCe, the method comprising the steps of: the MSCe receiving the call request; the MSCe communicating with a Home Location Register (HLR) in the wireless network; and upon receiving a response from the HLR, the response including a Session Initiation Protocol (SIP) Uniform Resource Identifier (URI) of the subscriber along with an Internet Protocol (IP) address of the second entry point for the IMS network, the MSCe routing the call request to the second entry point without invoking a Wireless Intelligent Network (WIN) operation and an associated routing number translation, the MSCe routing the call request by sending a SIP INVITE to the IP address of the second entry point.