Patent ID: 8743887

Claim:
A method for registering a wireless communication device for IP Multimedia Subsystem (IMS) services in a packet-based domain, comprising: activating a packet-switch domain on a wireless communication device; determining whether IMS services are supported over the packet-switch domain; determining if an Internet Protocol (IP) address assigned to an IMS application has changed, based on IMS services determined to be supported, and communicating an IMS registration request to a network entity within the packet-switch domain, if the IP address is determined to have changed; and determining if the wireless communication device supports a circuit-switched domain, if IMS services are determined to be not supported, and activating the circuit-switch domain if it is determined that the device supports a circuit-switched domain and communicating a message to a network entity in the circuit-switched domain that is operable to inform the circuit-switched domain that all network services are to provided by the circuit-switched domain.