User device selection

A device comprising:

• a memory to store a plurality of instructions;
• and
• a processor configured to execute instructions in the memory to:
• receive a session initiation protocol (SIP) message including a terminal identifier (ID) of a user device and a public user ID associated with a user of the user device;
• authenticate the user device;
• determine a registration context of the user device based on the terminal ID and the public user ID;
• store the registration context for the user device;
• send a SIP registration OK message to the user device;
• and
• send a SIP register message to an application server, wherein the SIP register message includes the terminal ID and the public user ID, and wherein the application server is to support an incoming session for the user device based on the registration context of the user device.

A non-transitory computer-readable medium including instructions, the instructions comprising:

• one or more instructions that, when executed by a processor, cause the processor to:
• receive a session initiation protocol (SIP) register message including a terminal identifier (ID) of a user device and a public user ID associated with a user of the user device;
• send, to a home subscriber server (HSS), a request for user authentication data, wherein the request includes the public user ID and the terminal ID;
• authenticate the user device based on the user authentication data;
• determine a registration context of the user device based on the terminal ID and the public user ID;
• store the registration context for the user device;
• send a SIP 200 OK message to the user device;
• and
• send a SIP register message to an application server, wherein the SIP register message includes the terminal ID and the public user ID, and wherein the application server is to provide an incoming session to the user device based on the registration context of the user device.