IP TELEPHONE SWITCHING SYSTEM AND IP SWITCHING SERVER

摘要

According to one embodiment, an IP telephone switching system, when processing of transmitting a state notification message is started in an IP switching server, whether it has been already determined that sending messages can be transmitted is determined in the call. If the messages cannot be transmitted, whether the number of destination terminals of the sending messages is greater than or equal to a threshold value is determined. If the number is greater than or equal to the threshold value, network load information is acquired. If the load is greater than or equal to the threshold value, an instruction to execute transmission propriety determination of the state notification message for each terminal.

主权项

1. An Internet Protocol (IP) telephone switching system comprising an IP switching server configured to accommodate IP telephone terminals in interfaces having different call control message protocols over an IP network, and to exchange a call control message and a terminal state notification message between the IP telephone terminals,
wherein the IP switching server comprises: a call controller configured to determine a sending call control message from combination of a receiving call control message from the IP network and a call state, and to provide an instruction to start transmitting a state notification message when a state of any of the IP telephone terminals is changed; a storage unit configured to store terminal state data indicative of a state of each of the IP telephone terminals; a manager configured to manage the state of each of the IP telephone terminals and to change the terminal state data stored in the storage unit when the state is changed; a call control message processor comprising the interfaces and configured to transmit a call control message to and receive a call control message from the IP telephone terminals accommodated in the interfaces under control of the call controller; a state notification message processor configured to transmit and receive a state notification message under control of the call controller; an overall notification determination unit configured to determine whether to transmit the state notification message to all IP telephone terminals capable of receiving the state notification message when the state notification message is transmitted; and an individual transmission determination unit configured to determine whether to transmit the state notification message to each of the IP telephone terminals when the state notification message is transmitted, the call controller instructs the state notification message processor to transmit the state notification message to all the IP telephone terminals on a condition that: transmission propriety determination has been already executed and a result of the determination is that the state notification message can be transmitted; number of destination terminals of the sending message is less than or equal to a threshold value; or a load on the IP network is less than or equal to a threshold value, the call controller instructs the individual transmission determination unit to execute transmission propriety determination of the state notification message for each of the IP telephone terminals when none of the above conditions is satisfied, and the call controller instructs the state notification message processor to transmit the state notification message to an IP telephone terminal determined by the individual transmission determination unit as a terminal to which the state notification message can be transmitted.