Patent ID: 7808976

Claim:
A voice communication server performing a voice communication process between a telephone connected to a line switching network employing a telephone number scheme and a plurality of communication devices connected to a packet switching network employing a communication address scheme which is different from the telephone number scheme, comprising: a processor which: receives a call setting request from the telephone, the call setting request including a number according to the telephone number scheme for identifying one of the communication devices as a communication partner; transmits a call setting response in response to the call setting request; obtains the communication address of the communication device according to the communication address scheme identified by the telephone number in the call setting request; transmits a voice communication request packet, whose destination is the obtained communication address, to the packet switching network for requesting the communication device to communicate with the telephone; receives a voice communication response packet in response to the voice communication request packet from the communication device to which the obtained communication address is assigned; and performs the voice communication process between the telephone and the communication device when the voice communication response packet indicates an accepting response; wherein the voice communication request packet includes the communication address, according to the communication address scheme, which identifies the voice communication server in the packet switching network and the communication address, according to the communication address scheme, which identifies the communication device in the packet switching network.