Patent ID: 7489677
Filing Date: 2009-02-10
Classification: H04Q

Abstract:
1. An exchange coupled to extension telephones, a public network, and a line concentrator and connecting an IP terminal unit to a packet network through the line concentrator, said exchange comprising: a channel accommodating portion for accommodating said extension telephones, coupled to said public network, and transmission processing voice communication data between an extension telephone or said public network and an IP terminal unit; and a call control portion for integrally managing call control information related to the communication between said extension telephone and said IP terminal unit and controlling, based on the call control information, said channel accommodating portion to perform the transmission processing of said communication voice data, wherein (a) when a voice communication is performed between an extension telephone or said public network and an IP terminal unit: said channel accommodating portion, when receiving call control information from said extension telephone or said public network, changes the call control information to a packet and transmits the packet to said call control portion through said packet network; said call control portion, when receiving the call control information converted to the packet from said channel accommodating portion, according to the call control information, notifies said channel accommodating portion of a destination address of the voice communication data which said channel accommodating portion receives from said extension telephone or said public network; said channel accommodating portion, when receiving the destination address from said call control portion, converts the voice communication data transmitted from said extension telephone or said public network to a packet, transmits the packet to said destination address, and performs the voice communication between said extension telephone or said public network and said IP terminal unit; or (b) when a voice communication is performed between two IP terminal units each other: said call control portion, when receiving call control information from a IP terminal unit through said packet network, according to the call control information, notifies said IP terminal unit and an IP terminal unit as an opposite party of a destination address of said voice communication data, thereby performs the voice communication between said two IP terminal units.