Patent ID: 7848231

Claim:
A packet communication network that is connected to a first external network and a second external network, and that executes packet communication between the first external network and the second external network for a plurality of services of which quality requirements on an end-to-end basis are different, the packet communication network comprising: a parallel network constituted by a plurality of physically or logically independent internal networks; at least one classifier connected to the first external network and to each internal network, when classifying a packet to one of the internal networks in the parallel network, the classifier identifying a packet as a voice packet when a pair of a transmission source address and a destination address as well as a destination port number are equal to a pair of addresses between which a conversation is held by a voice service and classifying the voice packet to a voice network among the internal networks; and at least one multiplexer that prioritizes a packet received from the voice network over a packet received from other internal networks, the at least one multiplexer being connected to each of the internal networks in the parallel network and to the second external network and multiplexing packets received from a plurality of internal networks in the parallel network when outputting a multiplexed packet to the second external network.