Internet protocol multimedia subsystem communication network for communication terminal, has call session control function networks accessing to domain name system module to determine internet protocol addresses of subsystem network

摘要

The network (RD1) has call session control function (CSCF) modules for accessing public identifiers of users stored corresponding to private identifiers (IPR1) of users and/or domain names of a receiver internet protocol multimedia subsystem (IMS) networks (RR1) of the users to determine a domain name of the IMS network after the user is subscribed. The CSCF networks access to a domain name system module to determine internet protocol addresses of an interrogating CSCF module of the IMS network whose domain name is provided, so as to transmit the message for processing the message.