Patent ID: 7519075

Claim:
A method of Voice over Internet Protocol (VoIP) in a network having a first device and a second device, the first device and the second device respectively having a network information corresponding to an internet based network with a registrar server, at least one proxy server and at least one redirect server, the method of VoIP in the network comprising: exchanging the network information between the first device and the second device through the network without a prior registration to the registrar server; sending a signaling invite request through the internet based network from the first device to the second device according to the network information of the second device; sending a signaling confirm through the internet based network from the second device to the first device if the second device accepts the signaling invite request; and replying with a signaling acknowledgement through the internet based network from the first device to the second device to establish a VoIP connection between the first device and the second device, wherein the signaling invite request, the signaling confirm and the signaling acknowledgement are transmitted without passing through the at least one proxy server and the at least one redirect server.