COMMUNICATION SYSTEM, SUBSCRIBER SYSTEM SERVER, RELAY SYSTEM SERVER, COMMUNICATION METHOD, CONTROL METHOD FOR THE SUBSCRIBER SYSTEM SERVER, CONTROL METHOD FOR RELAY SYSTEM SERVER, AND PROGRAM

摘要

PROBLEM TO BE SOLVED: To attain a communication system, capable of surely performing charging by providing technologies for dispatching a response message from the called-side server to a calling-side server more surely.;SOLUTION: A communication system includes: a first subscriber system server for receiving a request message from a user terminal connected to the server itself, describing own address in the request message as a reply address and transferring the request message; at least one stage of relay system server for relaying the request message transferred by the first subscriber system server; and a second subscriber system server for receiving the request message relayed by the relay system server, storing the reply address described in the received request message, transferring the request message to a communication apparatus connected to the server itself, and transferring a response message to the request message to the stored reply address, when the response message is received from the communication apparatus.;COPYRIGHT: (C)2010,JPO&INPIT