CALL PROCESSING SYSTEM AND A METHOD IN AN SIP NETWORK, ESPECIALLY RELATED TO DIRECTLY SETTING A CALL UP TO A RECEIVING TERMINAL FROM AN ORIGINATING PROXY SERVER, BY PERCEIVING AN IP ADDRESS OF A RECEIVING SUBSCRIBER FROM A SUBSCRIBER STATE MANAGEMENT SERVER

摘要

PURPOSE: A call processing system and a method in an SIP(Session Initiation Protocol) network are provided to process a subscriber state in real time by using a multi-message forwarding function of a proxy server, and to manage the processed state in a subscriber state management server, so that an originating subscriber can perceive a terminal state and an accessed IP address without setting a signal path up to a receiving terminal. CONSTITUTION: IP terminals(2,5) transceive media information including various voices and data through a set call. Proxy servers(3,4) receive messages on call setup and call cancellation from the IP terminals(2,5) located within self domains, and transmit the messages to a neighboring proxy server or other IP terminals disposed within the self domains. The proxy servers(3,4) simultaneously transmit the messages to a subscriber state management server(1), so that the subscriber state management server can manage a current state and an accessed IP address of a subscriber terminal in real time.