Patent ID: 8139604

Claim:
A method for processing session initiation protocol (SIP) signaling in a voice and data integrated switching system, the method comprising: transceiving a message and data between a terminal and a system using a Voice over Internet Protocol (VoIP) SIP “INFO” method upon communication being performed between the terminal and a second terminal via an Internet Protocol (IP) network and using a VoIP SIP “MESSAGE” method in an idle state if communication is not being performed between the terminal and the second terminal; processing proprietary signaling of a legacy voice switching system as standard signaling using standard VoIP SIP signaling; and simultaneously and separately processing the standard VoIP SIP signaling and the proprietary signaling of the legacy voice switching system in a system using the VoIP SIP signaling, wherein the steps of transceiving, processing, and simultaneously and separately processing are done by a single voice and data processing module, wherein the voice/data integrated switching system is configured to convert a Pulse Code Modulation (PCM)-coded voice signal from a PCM bus into voice data packets and to compress the converted voice data packets using an established compression scheme by the single voice and data processing module, and wherein simultaneously and separately processing the standard VoIP SIP signaling and the proprietary signaling of the legacy voice switching system, comprises: interfacing a communication of the standard VoIP SIP signaling with the second terminal in separation into an office line and an extension; performing format conversion of the communication through the office line and extension session initiation protocol interfaces; communicating the format-converted communication through the office line and extension session initiation protocol interfaces between the second terminal and the system using a MESSAGE method in a state in which a communication is not performed between the terminal and the second terminal, and using an INFO method in a state in which a call connection is performed between the terminal and the second terminal.