Patent ID: 7724729

Claim:
A communication server connected both to a line switching network, for transmitting/receiving voice information, to which a plurality of telephones are connected and to a packet switching network, for transmitting/receiving voice packets, to which at least one communication device is connected, comprising: a first input/output (I/O) portion which inputs and outputs packet information; a second input/output (I/O) portion which inputs and outputs non-packet information; a processor which; receives a voice communication request packet from the communication device via the first input/output (I/O) portion; transmits a call setting request requesting call setting with the telephone, identified by information included in the voice communication request packet, to the line switching network via the second input/output (I/O) portion; receives a call setting response from the line switching network via the second in input/output (I/O) portion; and transmits a voice communication response packet to the communication device via the first input/output (I/O) portion in response to the call setting request for making voice communication available between the communication device transmitting the voice communication request packet and the telephone which is a destination of the call setting request by converting between the voice information and the voice packet, wherein the voice communication request packet includes address information identifying the communication server in the packet switching network, address information identifying the communication device in the packet switching network, and the information identifying the telephone.