Abstract: A light-emitting device with favorable carrier balance is provided. The light-emitting device includes a light-emitting layer between a first electrode and a second electrode. The light-emitting layer includes at least a first substance and a light-emitting substance, the first substance includes an organic compound having one or more of a carbazole ring, an aromatic amine skeleton, and a ?-electron deficient heteroaromatic ring, a luminescence lifetime of delayed fluorescence caused by photoexcitation of the light-emitting substance is shorter at a first temperature than at a second temperature, the first temperature is lower than the second temperature, and the first temperature and the second temperature are each higher than or equal to 10 K and lower than or equal to 300 K.

Abstract: A highly efficient light-emitting device is provided. The light-emitting device includes a light-emitting layer between a first electrode and a second electrode. The light-emitting layer includes at least a light-emitting substance and a first substance, the half width of an emission spectrum of the light-emitting substance is 0.35 eV or less, the luminescence lifetime of delayed fluorescence caused by photoexcitation of the first substance is shorter at a first temperature than at a second temperature, the first temperature is lower than the second temperature, and the first temperature and the second temperature are each higher than or equal to 10 K and lower than or equal to 300 K.

Abstract: A call control device including: a memory, and a processor coupled to the memory and configured to: receive a call request from a communication device, a source of the call request being a terminal, the call request being transferred by the communication device when the terminal is registered in a management device, and request the management device to deregister the terminal when the call control device is determined that the call control device is attacked from the terminal based on the call request.

Abstract: A first call control server transmits line information of a line to be used by a terminal device calls of which are controlled by the first call control server to a second call control server when congestion is detected. The first call control server receives the line information to be used in call control from the second call control server, and establishes a connection with the terminal device using the received line information. The second call control server receives the line information from the first call control server, and receives a call control request for the terminal device, the call control request being addressed to the first call control server. The second call control server responds to the first call control server with the received line information, when the call control request is received.

Abstract: A call control device including: a memory, and a processor coupled to the memory and configured to: receive a call request from a communication device, a source of the call request being a terminal, the call request being transferred by the communication device when the terminal is registered in a management device, and request the management device to deregister the terminal when the call control device is determined that the call control device is attacked from the terminal based on the call request.

Abstract: A first call control server transmits line information of a line to be used by a terminal device calls of which are controlled by the first call control server to a second call control server when congestion is detected. The first call control server receives the line information to be used in call control from the second call control server, and establishes a connection with the terminal device using the received line information. The second call control server receives the line information from the first call control server, and receives a call control request for the terminal device, the call control request being addressed to the first call control server. The second call control server responds to the first call control server with the received line information, when the call control request is received.

Abstract: A route controlling apparatus is provided on a center side in a network having a carrier-redundant configuration in which the center side and a base side are connected using a plurality of different carriers, and includes a load distribution table that stores information for load distribution; and a controlling unit that creates, when data is received by a host on the center side from a host on the base side, a new entry in the load distribution table. In the new entry, a carrier selected for transmission of the data by a router on the base side is associated with an address of the host on the base side. The controlling unit refers to the entry to select the carrier as a route when data is to be transmitted from the host on the center side to the host on the base side.

Abstract: A route controlling apparatus is provided on a center side in a network having a carrier-redundant configuration in which the center side and a base side are connected using a plurality of different carriers, and includes a load distribution table that stores information for load distribution; and a controlling unit that creates, when data is received by a host on the center side from a host on the base side, a new entry in the load distribution table. In the new entry, a carrier selected for transmission of the data by a router on the base side is associated with an address of the host on the base side. The controlling unit refers to the entry to select the carrier as a route when data is to be transmitted from the host on the center side to the host on the base side.

Abstract: In an IP (Internet Protocol) gateway apparatus for storing a plurality of channels, voice signals supplied from the respective channels are packeted, and then the voice packets are sent out to an IP network. The IP gateway apparatus is provided with a synchronization timing generating apparatus for outputting a synchronization signal indicative of timing at which the voice signals of the respective channels are packeted, and a packeting apparatus for packeting the voice signals supplied from the respective channels in accordance with the synchronization signal outputted from the synchronization timing generating apparatus to thereby send out the voice packets to the IP network.

Abstract: A method of controlling affiliation of a remote line-collection device with a plurality of switches connected via a network includes the steps of providing each switch with a backup-storage area in advance in addition to a normal storage area, and transferring control data of the remote line-collection device from the normal storage area of a first switch to the backup-storage area of a second switch when affiliation of the remote line-collection device is changed from the first switch to the second switch.

Abstract: In an IP (Internet Protocol) gateway apparatus for storing a plurality of channels, voice signals supplied from the respective channels are packeted, and then the voice packets are sent out to an IP network. The IP gateway apparatus is provided with a synchronization timing generating apparatus for outputting a synchronization signal indicative of timing at which the voice signals of the respective channels are packeted, and a packeting apparatus for packeting the voice signals supplied from the respective channels in accordance with the synchronization signal outputted from the synchronization timing generating apparatus to thereby send out the voice packets to the IP network.