Patent ID: 6977896

Claim:
An IP communications network system comprising: a first QoS guaranteeing apparatus including: a condition database unit storing conditions specifying destination addresses with a QoS guarantee; a distinguishing unit working in conjunction with said condition database for classifying, as target traffics, specified data packets accordant with a specified condition among data packets transmitted from a multiplicity of data communications terminals; an encapsulating unit for encapsulating the classified specified data packets defined as a QoS guarantee target on the basis of IP addresses of two QoS guaranteeing apparatuses existing on the sides opposite to each other in a QoS guarantee target area in an IP packet switching network so that a set of the traffics appear as if being one session; and a resource reserving unit for reserving resources in accordance with the QoS guarantee protocol with respect to the set of encapsulated specified data packets, and a second QoS guaranteeing apparatus existing on the opposite side in the QoS guarantee target area, including: a receiving unit for receiving the encapsulated specified data packets, which have been QoS-guaranteed, via the IP packet switching network; and a de-capsulation unit for de-capsulating the encapsulated specified data packets received in order to forward these packets to an actual destination.