Patent ID: 8577010

Claim:
A telephone relay device provided in a first telephone communication network and relaying a telephone call on a first telephone terminal connected to the first telephone communication network, the telephone relay device being used in conjunction with an external telephone relay device, the external telephone relay device being provided in a second telephone communication network and relaying a telephone call on a second telephone terminal connected to the second telephone communication network, the telephone relay device comprising: a first virtual terminal; a second virtual terminal; a telephone exchange unit relaying a telephone call between the second telephone terminal and a third telephone terminal through the external telephone relay device, the third telephone terminal being outside the first telephone communication network and the second telephone communication network; a forwarding order reception unit receiving 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; a switching unit 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 by control of the telephone exchange unit, when the forwarding order reception unit receives the first forwarding order information; a calling unit putting the first virtual terminal on hold after the first virtual terminal connects 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 a connection processing unit 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.