Abstract: When a connection control device determines that the connection control device is in a congested state, based on whether a usage of at least one of hardware resources necessary for call processing to establish a call connection is equal to or more than a predetermined threshold value, the CPU of the connection control device forcefully disconnects an established call connection after a connection available time elapses, and, when an INVITE message is transmitted from a terminal device, the CPU of the connection control device receives the INVITE message, calculates the wait time, creates and transmits a response message stating the wait time, and stores the message as a reserved call on a reservation list.

Abstract: A network quality monitoring device includes a packet receiving unit that receives packets used by a signaling protocol server device that is a server device for processing the signaling protocol, a signaling protocol packet extracting unit that extracts signaling protocol packets for controlling the signaling protocol from packets received by the packet receiving unit, a session management table storing unit that stores the session management tables, a signaling protocol quality analyzing unit that collects quality information regarding the network quality from a session management table corresponding to sessions that have transitioned to a predetermined communication state among the session management tables stored in the session management table storing unit and, based on the collection result, analyzes statistical information regarding the network quality.

Abstract: A SIP server 100 includes a first memory 20 storing a route management table in which, of route set information specified by a SIP signal on a session-by-session basis, address information as of each Record-Route header value is associated with a logical number, the same address information as of a Record-Route header values being set to the same single logical number; and a second memory 30 storing session information other than the address information as of each Record-Route header value, instance management information for use in session control, and logical numbers. The address information as of each Record-Route header value, which is stored in the first memory 20 is read on the basis of the logical numbers stored in the second memory 30.

Abstract: A transmitting/receiving unit receives a SIP signal after occurrence of trouble in a SIP server and outputs a call ID of the SIP signal to a recovery-file searching unit. A session control unit once again procures a call process resource and an instance for a session corresponding to a recovery file and stores the call process resource data and the instance data in a main storage unit. The main storage unit stores anew session data included in the recovery file. A recovery-file creating unit creates the recovery file. An external storage unit stores therein the recovery file. The recovery-file searching unit retrieves from the external storage unit the recovery file that matches with the call ID output by the transmitting/receiving unit and outputs the recovery file to the session control unit and the main storage unit.

Abstract: A network quality monitoring device includes a packet receiving unit that receives packets used by a signaling protocol server device that is a server device for processing the signaling protocol, a signaling protocol packet extracting unit that extracts signaling protocol packets for controlling the signaling protocol from packets received by the packet receiving unit, a session management table storing unit that stores the session management tables, a signaling protocol quality analyzing unit that collects quality information regarding the network quality from a session management table corresponding to sessions that have transitioned to a predetermined communication state among the session management tables stored in the session management table storing unit and, based on the collection result, analyzes statistical information regarding the network quality.

Abstract: The SIP server includes a SIP communication controller for controlling transmission/reception of a SIP message complying with SIP, a SIP call controller for controlling calls by using SIP, a call data manager for managing communication state information which indicates communication state with the opposing server and bypass requirement information which indicates the need of skipping the opposing server determined for each session communication on the basis of recovery state of the opposing server, a bypass controller for determining whether to skip the opposing server which is set to be the next destination for each session communication in relaying the SIP message on the basis of the communication state information and the bypass requirement information of the opposing server, and a SIP header controller for editing a Route header of the SIP message in accordance with the result of the determination by the bypass controller.

Abstract: A SIP server 100 includes a first memory 20 storing a route management table in which, of route set information specified by a SIP signal on a session-by-session basis, address information as of each Record-Route header value is associated with a logical number, the same address information as of a Record-Route header values being set to the same single logical number; and a second memory 30 storing session information other than the address information as of each Record-Route header value, instance management information for use in session control, and logical numbers. The address information as of each Record-Route header value, which is stored in the first memory 20 is read on the basis of the logical numbers stored in the second memory 30.

Abstract: A transmitting/receiving unit receives a SIP signal after occurrence of trouble in a SIP server and outputs a call ID of the SIP signal to a recovery-file searching unit. A session control unit once again procures a call process resource and an instance for a session corresponding to a recovery file and stores the call process resource data and the instance data in a main storage unit. The main storage unit stores anew session data included in the recovery file. A recovery-file creating unit creates the recovery file. An external storage unit stores therein the recovery file. The recovery-file searching unit retrieves from the external storage unit the recovery file that matches with the call ID output by the transmitting/receiving unit and outputs the recovery file to the session control unit and the main storage unit.

Abstract: When a connection control device determines that the connection control device is in a congested state, based on whether a usage of at least one of hardware resources necessary for call processing to establish a call connection is equal to or more than a predetermined threshold value, the CPU of the connection control device forcefully disconnects an established call connection after a connection available time elapses, and, when an INVITE message is transmitted from a terminal device, the CPU of the connection control device receives the INVITE message, calculates the wait time, creates and transmits a response message stating the wait time, and stores the message as a reserved call on a reservation list.

Abstract: A server capable of reducing an overloaded state even if a refreshing message is frequently generated. A central processing unit receives a first message transmitted from a terminal to establish a session. The central processing unit, when receiving the first message from the terminal, allocates to itself and the other plural central processing units the subsequent message transmission and reception between the terminal and a terminal as a communication partner. The central processing unit allocates to itself and the other plural central processing units the message transmission and reception between the terminals, for example, in a round robin fashion.

Abstract: The present invention provides a control method of a server apparatus intervening in a generation, maintenance and disconnection of a session which is set up for communication between a plurality of client apparatuses connecting with each other by way of an information network, comprising the processes of retaining, by the server apparatus, first session management information relating to a billing out of session management information which is created within the server apparatus at a generation of the session, and transmitting second management information other than the first management information to the client apparatus; and recovering the second session management information from the client apparatus to the server apparatus at a disconnection of the aforementioned session.

Abstract: A method and a system for seizing at least one communication channel for use in a first call. Information on a plurality of states of a plurality of communication channels are held in an channel-state-information holding unit. Based on the information on the states of the communication channels, at least one optimum communication channel from among the plurality of communication channels is determined as the at least one communication channel, and seized for use in the first call. The determination is made so that after the above determination and seizure for the first call, consecutive communication channels for use in a second call can be successfully seized with high probability.