Patent ID: 8831018

Claim:
A media conversion device for relaying media communication between a plurality of communication terminal devices connected to a plurality of different networks, said media conversion device comprising: a server for discriminating communication media standards adopted by said communication terminal devices from control data controlling the media communication and supplied from said communication terminal devices, based on a call control protocol, to exercise call control for said communication terminal devices, said server including a first memory for storing the communication media standards and information used for communication; and a media converter, using the communication media standards thus discriminated, for converting in real-time media data supplied from said communication terminal devices into a signal of a relevant communication media standard, said media converter including a plurality of interfaces for receiving or outputting the control data, the media data and non-media data supplied from said communication terminal devices and for verifying whether or not received data is the media data, a converter circuit for converting communication media standards of received media data included in the data received from said communication terminal devices into media data of the relevant communication media standard of one of said communication terminal devices at an output destination, and a controller for reading out the information stored in said first memory, so as to control delivery of the read-out information to said interfaces and said converter circuit, and in turn to control said interfaces, said converter circuit and a data switcher, said data switcher switching data transfer to said interfaces, said converter circuit and said controller, said information stored in said first memory including a session identifier identifying a call, session identification information identifying an IP address and a port number of a destination of the call, and an encoding rule of the destination, wherein each of said plurality of communication terminal devices belongs to one of a plurality of communication terminal device groups, said information stored in said first memory including information on which of the plurality of groups to which one of said communication terminal devices belongs, and also including information specifying which of the communication media standards is adopted for the group to which said one communication terminal device belongs, said server being responsive to delivery of a control signal from said one to another of said communication terminal devices to discriminate which of the communication media standards is adopted by another said communication terminal device based on the control signal and the information stored in said first memory.