Abstract: A management system includes a reception unit configured to receive identification information for identifying an account, allocated by an authentication apparatus, corresponding to a terminal, the terminal being authenticated by the authentication apparatus, and a management unit configured to determine whether a function provided by the management system can be used by the terminal based on the identification information received by the reception unit.

Abstract: A management system, a communication system, and a transmission control method. The management system includes a receiver to receive information of a predetermined attribute, circuitry to determine whether the predetermined attribute is associated with a client, and a transmitter to send the information received by the receiver to a communication terminal that is authenticated by a client when the predetermined attribute is associated with the client. The communication system includes an authentication system and a management system. The authentication system includes an acceptance unit to accept an authentication request from a client, and an authentication processing unit to authenticate the client. In the communication system, the authentication system and the management system communicate with each other through a communication network.

Abstract: A communication terminal, a communication system and an output method. The communication terminal and the output method include storing, in a memory, a plurality of communication applications including a first communication application and a second communication application, outputting first status information indicating a first status of the first communication application according to a call control information transmitted by the first communication application, and outputting second status information indicating a second status of the second communication application according to a resource that is used by the first communication application in the first status. The communication system includes a publish-subscribe server and the communication terminal, and the communication terminal further includes sending a pub request to publish the call control information and a sub request to subscribe to the call control information to the publish-subscribe server.

Abstract: A control apparatus includes at least one processor configured to receive a request from a first communications terminal from among a plurality of communications terminals to select one or more relay apparatuses that relay content data transmitted and received between the first communications terminal and a second communications terminal from among the communications terminals; select one or more relay apparatuses included in one or more networks usable by the first communications terminal and the second communications terminal in response to the received request; and transmit identification information of the selected one or more relay apparatuses to the first communications terminal.

Abstract: A management system for managing a session for transmitting content data between a first terminal and a second terminal via a first relay apparatus and a second relay apparatus is provided. The management system includes a determination unit configured to determine a transmission quality of the content data transmitted in the session based on a transmission quality of the content data available for the first terminal and a transmission quality available for the second terminal, a first selection unit configured to select a first relay apparatus to which the first terminal is to be connected based on the determined transmission quality, and a second selection unit configured to select a second relay apparatus to which the second terminal is to be connected.