Abstract: The disclosure relates to a 5G communication system or a 6G communication system for supporting higher data rates beyond a 4G communication system such as long term evolution (LTE). In a wireless communication system, a method performed by a first user equipment (UE) may include: obtaining at least one phone number from a plurality of usable sources, classifying, based on a usage state, the at least one phone number into one of a permanent state, a temporary state, or an invalid state, and transmitting a session initiation protocol (SIP) message including information associated with the at least one classified phone number to a second UE.

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.