TERMINAL-TO-TERMINAL COMMUNICATION CONNECTION CONTROL METHOD USING IP TRANSFER NETWORK

摘要

PROBLEM TO BE SOLVED: To provide a terminal-to-terminal communication connection control method that can be applied to multimedia communication such as communication between IP phones, audio visual communication and IP multicast communication. SOLUTION: Both a connection server and a relay connection server are installed in an IP transfer network, a function similar to a line connection control of a subscriber exchanger (LS) is applied to a connection server, a function similar to a line connection control of a relay exchanger (TS) is applied to the relay connection server, and a terminal-to-terminal communication connection control method with using the IP transfer network is realized in such a manner that a telephone set and a terminal such as an IP terminal and a video terminal transmit/receive an initial address message(IAM), an address completion message(ACM), a call pass message (CPG), an answer message(ANM), a release message (REL), a release completion message (RLC), which can be made in a 1-to-1 correspondence relationship with line connection control messages of the common line signal system. Furthermore, while an address administration table is set to a network node apparatus of an IP transfer network, means for registering addresses of the terminals into this address administration table is employed, so that an IP packet communication by a multicast can be realized with improved information security performance.