Patent ID: 8537797

Claim:
A method for registering a mobile device with an Internet Protocol Multimedia Subsystems (IMS) core network and determining the location determination capabilities of the mobile device, the method comprising: receiving a Session Initiation Protocol (SIP) registration message with extended header information from a requesting mobile device, the extended header information including an indication of an International Mobile Equipment Identity (IMEI) of the requesting mobile device and an indication of an International Mobile Subscriber Identity (IMSI) associated with the requesting mobile device; parsing the extended header information to determine the IMEI and the IMSI of the requesting mobile device; retrieving a registration status of the requesting mobile device using the IMEI of the requesting mobile device; determining whether the combination of the IMEI and IMSI is a valid combination; determining whether to deny registration of the requesting mobile device with the IMS core based at least in part on the retrieved registration status of the requesting mobile device and the validity of the combination; and retrieving location determination capabilities of the requesting mobile device using the IMEI of the requesting mobile device in order to allow the location of the mobile device to be determined.