Network system

A network system comprising:

• an ATM switch;
• and
• a plurality of terminal devices, each of the terminal devices comprising:
• a requesting unit transmitting, when a communication channel for transmitting a data is established between any of the terminal devices as a call-out terminal and other terminal as a call-in terminal through the ATM switch, a request for receiving a signaling protocol information about a signaling protocol for establishing the communication channel used by the other terminal device, to said ATM switch;
• a first changing unit for changing, when the terminal-device receives the signaling protocol information from the ATM switch as a call-out terminal, a signaling protocol for establishing the communication channel used by the terminal device into a signaling protocol corresponding to the signaling protocol information of the other terminal device;
• a first storing unit storing a signaling protocol information about a signaling protocol used by the terminal device itself;
• and
• a responding unit transmitting, when the terminal device receives the request from said ATM switch as the call-in terminal, the signaling protocol information stored in the first storing unit to said ATM switch,
• the ATM switch comprising:
• a transferring unit transferring, when the ATM switch receives the request from a terminal device as a call-out terminal, this request to a terminal device as a call-in terminal and transferring, when the ATM switch receives a signaling protocol information from a terminal device as a call-in terminal, this signaling protocol information to as a call-out terminal which has transmitted the request.

A network system comprising:

• an ATM switching system;
• and
• a plurality of terminal devices,
• each of the terminal devices comprising:
• a requesting unit transmitting, when a communication channel for transmitting a data is established between any of the terminal devices as a call-out terminal and other terminal device as a call-in terminal through the ATM switch, a signaling protocol information for establishing the communication channel used by a signaling protocol the call-out terminal itself and a change request for changing a signaling protocol used by the call-in terminal device into the signaling protocol used by the call-out terminal device, to the ATM switch;
• and
• a first changing unit changing, when the terminal device, as a call-in terminal receives the signaling protocol information and the change request from the ATM switch, a signaling protocol used by the terminal device itself into a signaling protocol corresponding to the received signaling protocol information of the other terminal device, and
• the ATM switch comprising:
• a transferring unit transferring, when the ATM switch receives the signaling protocol information and the change request transmitted by the requesting unit, this signaling protocol information and the change request to a call-in terminal.

A network system comprising:

• a LAN emulation server;
• a plurality of ATM switches;
• and
• a plurality of terminal devices, each of the terminal devices comprising:
• a requesting unit transmitting, when a communication channel for transmitting a data is established between any of the terminal devices as a call-out terminal and an other terminal device as a call-in terminal through the ATM switch, a supply request for receiving a signaling protocol information for establishing the communication channel used by the call-in terminal, to one of the plurality of ATM switches;
• and
• a first changing unit changing, when the terminal device receives a signaling protocol information from one of the ATM switches as a call-in terminal, a signaling protocol used by the terminal device on the basis of this piece of the received signaling protocol information of the other terminal device,
• each of the ATM switches comprising:
• a transferring unit transferring, when the ATM switch receives the supply request from a terminal device as a call-out this supply request to the LAN emulation server and transferring, when the ATM switch receives a signaling protocol information about a signaling protocol used by a terminal device as a call-in terminal from said LAN emulation server, this signaling protocol information to the terminal device that has transmitted the supply request,
• the LAN emulation server comprising:
• a first storing unit storing a signaling protocol information about the signaling protocol used by each of the terminal devices respectively;
• and
• a supplying unit reading out, when the LAN emulation server receives the supply request from one of the ATM switches, a signaling protocol information corresponding to the supply request from the first storing unit used by said other terminal device that is stored in said first storing unit and transmitting the read signaling protocol information to the ATM switch which that has transmitted the supply request.

A method of establishing a communication channel for transmitting data between a terminal devices as a call-out terminal and other terminal device as a call-in terminal through an ATM switch,

• the method comprising:
• a step of causing the call-out terminal, when the communication channel is established between the call-out terminal and the call-in terminal, to transmit a supply request for receiving a signaling protocol information used by the call-in terminal to the ATM switch;
• a step of causing the ATM switch receiving the supply request to transmit a signaling protocol information corresponding to the supply request to the call-out terminal;
• a step of causing the call-out terminal received the signaling protocol information from the ATM switch to change a signaling protocol used by the call-out terminal itself to a signaling protocol used by the call-in terminal on the basis of the signaling protocol information of the call-in terminal;
• and
• a step of causing the call-out terminal that has changed the signaling protocol to execute a massage exchange for establishing the communication channel with respect to said call-in terminal.

A method of establishing a communication channel for transmitting data between a terminal device as a call-out terminal and other terminal device as a call-in terminal through an ATM switch,

• the method comprising:
• a step of causing one of the call-out terminal, when the communication channel is established between the call-out terminal and the call-in terminal, to transfer a supply request for receiving a signaling protocol information for Establishing the communication channel used by the call-in terminal, to the ATM switch;
• a step of causing the ATM switch received the supply request from the call-out terminal to transfer the supply request to the call-in terminal;
• step of causing the call-in terminal received the supply request from the ATM switch to transmit the signaling protocol information corresponding to the supply request to said ATM switch;
• a step of causing the ATM switch received the signaling protocol information from the call-in terminal to transfer this signaling protocol information to the call-out terminal;
• a step of causing the call-out terminal received the signaling protocol information from the ATM switch to change a signaling protocol used by the call-out terminal itself to the signaling protocol used by the call-in terminal on the basis of the signaling protocol information of the call-in terminal;
• and
• a step of causing the call-out terminal that has changed the signaling protocol to execute a message exchange for establishing the communication channel with respect to the call-in terminal.

A method of establishing a communication channel for transmitting a data between a terminal device as a call-out terminal and other terminal device as a call-in terminal through an ATM switch,

• the method comprising:
• a step of causing the call-out terminal, when the communication channel established between the call-out terminal and the call-in terminal, to transmit a signaling protocol information for establishing the communication channel used by the call-out terminal, and a change request for changing a signaling protocol used by the call-in terminal to a signaling protocol used by the call-out terminal, to the ATM switch;
• a step of causing the ATM switch received the signaling protocol information and the change request to transfer to the call-in terminal;
• a step of causing the call-in terminal received the signaling protocol information and the change request to change a signaling protocol used by the call-in terminal itself to a signaling protocol used by the call-out terminal on the basis of the signaling protocol information of the call-in terminal and the change request;
• and
• a step of causing the call-out terminal to execute a message exchange for establishing the communication channel with respect to the call-in terminal that has changed the signaling protocol.

A method of establishing a communication channel for transmitting a data between a terminal device as a call-out terminal and an other terminal device as a call-in terminal through a LAN emulation server and a plurality of ATM switches,

• the method comprising:
• a step of causing the call-out terminal, when the communication channel is established between the call-out terminal and the call-in terminal, to transmit a supply request for supplying a signaling protocol information for establishing the communication channel used by the call-in terminal, to one of the plurality of ATM switches;
• a step of causing the ATM switch received the supply request to transfer the supply request to the LAN emulation server;
• a step of causing the LAN emulation server received the supply request to read out a signaling protocol information corresponding to the supply request and to transmit this signaling protocol information to the ATM switch that has transferred the supply request;
• a step of causing the ATM switch received the signaling protocol information from the LAN emulation server to transfer the sign protocol information to the call-out terminal;
• a step of causing the call-out terminal received the signaling protocol information to change a signaling protocol used by the call-out terminal itself to a signaling protocol used by the call-in terminal device on the basis of the signaling protocol information of the call-in terminal;
• and
• a step of causing the call-out terminal changed a signaling protocol to execute a message exchange for setting the call with respect to the call-in terminal.