Patent ID: 11917725
Assignee: LENOVO (SINGAPORE) PTE. LTD.
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 10:
11. A method at a network entity, the method comprising:
receiving a session initiation protocol register request message for restricted local operator services (RLOS) at a Proxy Call Session Control Function (P-CSCF), the session initiation protocol register request message including an Internet Protocol (IP) multimedia public user identification for a user equipment (UE);
forwarding the session initiation protocol register request message to a Serving Call Session Control Function (S-CSCF);
receiving a UE identifier in a 200 OK response in response to forwarding the session initiation protocol register request message at the P-CSCF from the S-CSCF; and
ciphering signaling using a security key for the UE in response to receiving the 200 OK response.