Patent ID: 8750286

Claim:
A communication network system including a connectionless type communication network and a connection type communication network, wherein a communication device forming said communication network comprising: a unit which transfers in-band, which means the same line as that of main signal traffic, control information, which is information exchanged between said communication devices to control said connectionless type communication network, to be exchanged on an in-band of said connectionless type communication network to other communication device through a virtual control link generated on an IP control network for controlling said connection type communication network and exchanges said in-band control information with other communication device; a unit which determines whether to generate a new connection for said connection type communication network based on said in-band control information to be exchanged; and a unit which generates a new connection for said connection type communication network in response to an instruction from said determination unit, wherein said determination unit, when receiving said in-band control information including an ACK returned from said other communication device having received said in-band control information, refers to an IP address of said other communication device to determine to generate a new connection for said connection type communication network between said communication device and said other communication device.