Caller information verification based on plurality of sims

A method for performing communication based on a plurality of Subscriber Identification Module (SIM), the method performed by a terminal and comprising:

• transmitting a registration request message including information related to a plurality of SIMs to an Access and Mobility Management Function (AMF) node of a first network through a base station of a first network;
• transmitting a Session Initiation Protocol (SIP) registration message including information related to the plurality of SIMs to a Proxy Call Session Control Function (P-CSCF) node of the first network through a base station of the first network;
• and
• while the terminal performs communication in the second network, receiving a paging message or a Non Access Stratum (NAS) notification message including information related to the service type of the downlink data for the terminal and ID information of a caller from the AMF node of the first network through the base station of the first network,
• wherein the information related to a plurality of SIMs included in the SIP registration message is used for an application server (AS) to obtain ID information of a caller in the SIP message related to the downlink data.

A wireless communication device for performing communication based on a plurality of Subscriber Identification Module (SIM), comprising:

• at least one processor;
• and
• at least one memory for storing instructions and operably electrically connectable with the at least one processor;
• wherein the operations performed based on the execution of the instructions by the at least one processor include:
• transmitting a registration request message including information related to a plurality of SIMs to an Access and Mobility Management Function (AMF) node of a first network through a base station of a first network;
• transmitting a Session Initiation Protocol (SIP) registration message including information related to the plurality of SIMs to a Proxy Call Session Control Function (P-CSCF) node of the first network through a base station of the first network;
• and
• while the terminal performs communication in the second network, receiving a paging message or a Non Access Stratum (NAS) notification message including information related to the service type of the downlink data for the terminal and ID information of a caller from the AMF node of the first network through the base station of the first network,
• wherein the information related to a plurality of SIMs included in the SIP registration message is used for an application server (AS) to obtain ID information of a caller in the SIP message related to the downlink data.