Abstract: The disclosure relates to a fifth generation (5G) or sixth generation (6G) communication system for supporting a higher data transfer rate. A method performed by a user equipment in a wireless communication system is provided. The method includes executing an application in the user equipment, identifying a user equipment route selection policy (URSP) rule mapped to the application, based on configuration information on the application, identifying a single-network slice selection assistance information (S-NSSAI) mapped to the application, based on the URSP rule mapped to the application, and transmitting a message requesting registration of the S-NSSAI mapped to the application to a core network via a base station. The S-NSSAI may correspond to a network slice selection assistance information (NSSAI) not allowed by the core network to be registered among NSSAIs configured for the user equipment.

Abstract: A method performed by an electronic device is provided. The method includes transmitting, to another electronic device through a server, a session initiation protocol (SIP) INVITE message for a connection request of a session. The SIP INVITE message includes information for indicating an authentication request. The method includes receiving, from the other electronic device through the server, a SIP information message for indicating a ringing including information for indicating an authentication support. The method includes identifying whether an SIP response message for indicating a success of the connection request is received from the other electronic device or a target electronic device for a call forwarding or not. The method includes establishing the session in response to a reception of the SIP response message. The reception of the SIP response message indicate an authentication success in the other electronic device or the target electronic device, according to the authentication request.