摘要:
Even when all of usable sessions are in use, a communication can be established for a new session and the interrupted session is automatically restored. Information on degrees of importance of communication sessions and information of restoration requirement are set in advance and stored in a session importance table in association with identifier (URI) of communication initiating terminals and identifier of destinations of communication. When a connection request for a session having a high degree of importance such as an emergency session is received, the session having the lowest degree of importance is selected and interrupted. Information of the interrupted session such as the communication initiator identifier and the communication destination identifier is stored in a session restoration table. The session is automatically restored as soon as a session resource becomes unoccupied according to the communication initiator identifier and the communication destination identifier stored in the session restoration table.
摘要:
A router checks traffic with respect to the SIP server at reception of a request message addressed to an SIP server from an SIP terminal. If the traffic exceeds a band allocated to the SIP server, the router transfers the request message to a congestion server.
摘要:
A failure detection protocol is applied so that failure detection requests for the same aggregated link can be processed even when the failure detection requests differ among routing protocols. The failure detection protocol is executed for each of the physical links that form an aggregated link, and a notification is sent to a higher-level application (for example, a routing protocol), which is a requesting source of a communication line failure monitoring request, with a discrimination between a case in which the communication of the aggregated link in its entirety fails and a case in which some physical links of the aggregated link fail.
摘要:
A failure detection protocol is applied so that failure detection requests for the same aggregated link can be processed even when the failure detection requests differ among routing protocols. The failure detection protocol is executed for each of the physical links that form an aggregated link, and a notification is sent to a higher-level application (for example, a routing protocol), which is a requesting source of a communication line failure monitoring request, with a discrimination between a case in which the communication of the aggregated link in its entirety fails and a case in which some physical links of the aggregated link fail.
摘要:
Erroneous detection of a failure in spite of the absence of failure on the route on account of a communication delay is to be prevented. A node device detects a failure on the route to a remote node device is detected by a failure to receive a packet from the remote node device after the elapse of a determined detection time. The node device sets “remote system transmission interval x detection multiplier” to be a first detecting time on the basis of a packet transmission interval determined by negotiation with the remote node device. It also sets the sum of “remote system actual transmission interval x detection multiplier” and “tolerable delay time” to be a second detecting time. The first detecting time and the second detecting time are compared, and what is longer is determined as the detecting time to be applied to actual operation.
摘要:
Erroneous detection of a failure in spite of the absence of failure on the route on account of a communication delay is to be prevented. A node device detects a failure on the route to a remote node device is detected by a failure to receive a packet from the remote node device after the elapse of a determined detection time. The node device sets “remote system transmission interval×detection multiplier” to be a first detecting time on the basis of a packet transmission interval determined by negotiation with the remote node device. It also sets the sum of “remote system actual transmission interval ×detection multiplier” and “tolerable delay time” to be a second detecting time. The first detecting time and the second detecting time are compared, and what is longer is determined as the detecting time to be applied to actual operation.
摘要:
A network system includes a session control server and a presence server. The session control server includes a presence information update unit that is started when the status changes and notifies the presence server of the changed status. The presence server includes a presence information control unit that controls the consistency of the notified update information.
摘要:
In an access network linked to the core network that provides a service to a user equipment device, there is provided a QoS control system in which a QoS policy is decided based on the access type between user equipment device and the access network. The QoS control system for controlling allocation of the service comprises a QoS policy decision server deciding the policy of QoS to the requested service from the user equipment, an access gateway for connecting the access network and the core network. The QoS policy decision server decides the policy of QoS based on the type of access between the access network and the user equipment.
摘要:
Provided is a computer system including: a first computer; a second computer including a second processor and a second memory; and a communication controller for controlling communication between the first and second computers, in which: upon reception of a packet from the first computer, the communication controller translates address information of the received packet to transfer the packet to the second computer; the second memory stores SA candidate information as SA information in which a part of the address information is unknown; and the second processor decrypts the packet encrypted by the first computer by using the SA candidate information upon reception of the encrypted packet from the first computer, and creates SA information based on the SA candidate information used for the decryption and the address information of the encrypted packet upon successful decryption of the encrypted packet.
摘要:
Disclosed here is a method for sending/receiving a message through a session control server disposed in each of hierarchical layers of a network system having a hierarchical structure. To achieve the above object, each of the session control servers is provided with operation mode confirming means for confirming a set operation mode and fixed destination solution means for setting an address so as to relay each received message to a specific address in accordance with the set operation mode. The session control server is also provided with location solution means for registering/managing a public address to be opened to external by a user and a user address given in the sub-domain to which the user belongs actually. Because a parent domain address can be used as an address to be opened to external for operating the session control server, the problems to occur due to a change of the user belonging sub-domain can be hidden from external and the parent domain can manage message traffics collectively.