Patent ID: 7756117

Claim:
A communication terminal coupled to a voice communication server, the voice communication server performing a voice communication process between one of a plurality of telephones coupled to a line switching network and the communication terminal which is also coupled to a packet switching network, the line switching network employing a telephone numbering scheme and the packet switching network employing a communication addressing scheme which is different from the telephone numbering scheme, the communication terminal comprising: a voice input unit which inputs voice information; a voice encoder which encodes the voice information; a voice decoder which decodes encoded voice information; and a transceiver which transmits to and receives from the voice communication server a voice communication requesting packet for requesting a voice communication and a voice data packet including the voice information, when the communication terminal is input with a telephone number, complying with the telephone numbering scheme, which specifies the one of the plurality of telephones, wherein the transceiver transmits and receives the voice data packet and the voice communication requesting packet using a first protocol and/or a second protocol.