Telephone relay device, method of relaying telephones, and program therefor

A method of relaying telephone calls,

• wherein a first virtual terminal and a second virtual terminal are provided in a telephone relay device, the telephone relay device being provided in a first telephone communication network and relaying a telephone call on a first telephone terminal connected to the first telephone communication network,
• wherein the telephone relay device
• relays a telephone call between a second telephone terminal and a third telephone terminal through an external telephone relay device, the second telephone terminal being connecting to a second telephone communication network, the third telephone terminal being outside the first telephone communication network and the second telephone communication network, and the external telephone relay device being provided in the second telephone communication network,
• receives first forwarding order information, the first forwarding order information being ordering forwarding of the telephone call between the second telephone terminal and the third telephone terminal from the second telephone terminal to the first telephone terminal,
• switches an access point of the third telephone terminal to the first virtual terminal and switches an access point of the second telephone terminal to the second virtual terminal, when the first forwarding order information is received,
• puts the first virtual terminal on hold after connecting the first virtual terminal to the third telephone terminal, and then calls the first telephone terminal by forwarding outgoing from the first virtual terminal to the first telephone terminal, and
• connects the first telephone terminal to the second telephone terminal through the first telephone terminal and the second virtual terminal after response of the first telephone terminal, and then connects the first telephone terminal to the third telephone terminal when receiving second forwarding order information, the second forwarding order information being ordering of switch of the access point of the first telephone terminal from the second telephone terminal to the third telephone terminal.

A non-transitory computer readable media recording a program for causing a computer to function as a telephone relay device relaying a telephone call on a first telephone terminal connected to a first telephone communication network, the program for causing the computer to execute functions of:

• building a first virtual terminal;
• building a second virtual terminal;
• relaying a telephone call between a second telephone terminal and a third telephone terminal through an external telephone relay device, the second telephone terminal being connecting to a second telephone communication network, the third telephone terminal being outside the first telephone communication network and the second telephone communication network, and the external telephone relay device being provided in the second telephone communication network;
• receiving first forwarding order information, the first forwarding order information ordering forwarding of the telephone call between the second telephone terminal and the third telephone terminal from the second telephone terminal to the first telephone terminal;
• switching an access point of the third telephone terminal to the first virtual terminal and switching an access point of the second telephone terminal to the second virtual terminal, when the first forwarding order information is received;
• putting the first virtual terminal on hold after connecting the first virtual terminal to the third telephone terminal, and then calling the first telephone terminal by forwarding outgoing from the first virtual terminal to the first telephone terminal;
• and
• connecting the first telephone terminal to the second telephone terminal through the first telephone terminal and the second virtual terminal after response of the first telephone terminal, and then connecting the first telephone terminal to the third telephone terminal when receiving second forwarding order information, the second forwarding order information being ordering switch of the access point of the first telephone terminal from the second telephone terminal to the third telephone terminal.