Support for manual roaming for volte

A method for manual roaming in a telecommunications network, the method comprising:

• at a User Equipment, UE:
• sending, to a Proxy Call/Session Control Function, P-CSCF, in the telecommunications network, a request for establishing a session to access the telecommunications network, the request comprising an indication that the UE supports Restricted Local Operator Services, RLOS;
• at the P-CSCF:
• receiving from the UE, the request for establishing the session;
• in response to determining that the UE is not authenticated, sending the request to a Serving Call/Session Control Function, S-CSCF, to indicate that the UE is a RLOS user;
• in response to determining that the UE is authenticated, sending the request to the S-CSCF to indicate that the UE is a Local Operator Service, LOS, user;
• at the S-CSCF:
• receiving the request from the P-CSCF;
• determining whether the request is for RLOS or LOS;
• in response to determining that the request is for RLOS, creating a record for the UE and a default profile allowing the UE to only make calls;
• and
• in response to determining that the request is for LOS, creating the default profile allowing the UE to make and receive calls;
• and
• at the UE:
• performing one of the following actions:
• establishing an Internet Protocol, IP, Multimedia Subsystem, IMS, session based on the default profile created by the S-CSCF to thereby only make calls if the UE is determined to be the RLOS user;
• and
• establishing an IMS session with a selected CSCF determined by the P-CSCF to thereby make and receive calls if the UE is determined to be the LOS user.