Patent ID: 7830886

Claim:
A router that has a router identifier and controls Quality of Service (QoS) of a communication with a terminal for each user identifier or terminal identifier according to an instruction from a Session Initiation Protocol (SIP) server, wherein the router being used in a network system which includes terminals that transmit and receive a packet or a message and, the SIP server that stores the user identifier or the terminal identifier of the terminal which the router serves and a certain QoS type corresponding to the router identifier of the router and, instructs the router identified by the router identifier to control QoS in accordance with the QoS type corresponding to the terminal, wherein a session is established between the terminals by the SIP server, wherein the router is located on a routing path through which data between terminals is transferred and, the router transfers the data between the terminals, and wherein the router comprises: a first interface that transmits and receives the packet or the message with the terminal; a second interface that transmits and receives the packet or the message, with the SIP server; and a controller that processes the packet or the message transmitted and received through the first and the second interfaces, and controls a communication between the terminal and the SIP server, wherein the controller, in a case that the packet or the message received through the first interface is addressed to the SIP server and is a REGISTER message including the user identifier and the terminal identifier, adds the router identifier to the REGISTER message and transmits the added REGISTER message to the SIP server through the second interface, the controller receives, from the SIP server through the second interface, the QoS type for the user identifier or the terminal identifier updated in accordance with the REGISTER message and, controls QoS of the communication through the first interface based on the QoS type for each user.