Patent ID: 8345556
Filing Date: 2013-01-01
Classification: H04L

Abstract:
1. A congestion control system for controlling a congestion of an IP telephony network in which a communication processing of a telephone call is performed by use of an IP packet, comprising: a service edge node for controlling an IP telephone call initiation request received from an IP communication terminal based on a congested state of a call control server connected to a core network for providing a subscriber with an IP telephone service; and a guidance server for providing a guidance service to the IP communication terminal without intermediation of the core network, the service edge node and the guidance server being disposed in an edge region located between an access network for connection to the IP communication terminal of the subscriber and the core network, wherein the service edge node is to control the IP telephone call initiation request based on monitoring the congested state of the call control server by a congestion control node, and by receiving a signal from the congestion control node indicating the congested state of the call control server, wherein the service edge node controls the IP telephone call initiation request received from the IP communication terminal based on the congested state of the call control server and a priority assigned to the subscriber for an IP telephone, and wherein the service edge node is configured to: perform, in a case where the call control server is in a lightly congested state, a connection with respect to the call control server in response to the IP telephone call initiation request received from the IP communication terminal of a prioritized subscriber having a high priority; and transfer the IP telephone call initiation request received from the IP communication terminal of a general subscriber having a low priority to the guidance server; and the guidance server transmits a guidance indicating an occurrence of the congested state to the IP communication terminal of a call initiation source.