Communication system, server, communication method, and storage medium

摘要

A communication system capable of preventing data transmission to a terminal not desired by the user, and setting a redirect destination of data from a terminal desired by the user. A SIP server transmits address information of a first terminal to an external apparatus when the SIP server receives a connection request to the first terminal from the external apparatus. The SIP server determines whether or not to permit a second terminal to be set as a redirect destination of the connection request when it is requested by the user to set the second terminal as the redirect destination, and sets the second terminal as the redirect destination according to the determination. Then, the SIP server transmits address information of the second terminal to the external apparatus when it receives the connection request in a state where the second terminal is set as the redirect destination.

主权项

1. A communication system in which a plurality of terminals including at least a first terminal and a second terminal and a server are connected to each other via a communication line, for performing data communication using a predetermined communication control protocol,
wherein the server comprises: a response unit configured to transmit address information of the first terminal to an external apparatus when the server receives a connection request to the first terminal from the external apparatus; a storage unit configured to store information indicative of a terminal which can be set as the redirect destination of the connection request to the first terminal; a determination unit configured to determine whether or not to permit the second terminal to be set as a redirect destination of the connection request to the first terminal when the server received from the second terminal a request for setting the second terminal as the redirect destination; a setting unit configured to set the second terminal as the redirect destination of the connection request to the first terminal when it is determined by said determination unit that the second terminal is permitted to be set as the redirect destination of the connection request to the first terminal; and a control unit configured to control said response unit such that said response unit transmits a response of address information of the second terminal when the server receives the connection request to the first terminal in a state where the second terminal is set as the redirect destination of the connection request to the first terminal by said setting unit, wherein said determination unit determines that the second terminal is permitted to be set as the redirect destination of the connection request to the first terminal when information indicative of the second terminal is stored in said storage unit, whereas when no information indicative of the second terminal is stored in said storage unit, said determination unit determines that the second terminal is not permitted to be set as the redirect destination of the connection request to the first terminal, and wherein at least one of the response unit, the storage unit, the determination unit, the setting unit, and the control unit is implemented by a processor and a memory.