Fujitsu Corporation

Akio Koga

Tomoyuki Furutono

Masahiro Tanaka

Hiromitsu Kajiyama

Junji Tagane

Norimichi Hiroshige

Hideo Okawa

Shigehiko Hirata

Ryouji Nakamatsu

Minoru Nishida

Ryuji Oda

Kaori Chigusa

Ryuji Fukuhara

Naohiro Ozaki

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.

Call control device, call control method, and call control system

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.

Telephony system, connection control method, connection control device and recording medium

A communication system capable of securely preventing illegal use of addresses and enhancing confidentiality of communication. Based on an originating-side real address which is the real address of an originating-side client terminal and specific information included in a registration message, a conversion data generator generates conversion data which the local server alone can convert to a receiving-side real address which is the real address of a receiving-side client terminal, and transmits the conversion data to the originating-side client terminal. A session controller receives a first session establishment request message, obtains the receiving-side real address from the conversion data and the originating-side real address included in the first session establishment request message, and transmits a second session establishment request message to the receiving-side real address, whereby a session is established between the originating-side and receiving-side client terminals without directly using the originating-side and receiving-side real addresses uniquely assigned on the network.

Communication system and session establishment method

Growing community of inventors

Fukuoka, Japan

Akio Koga