Fujitsu Corporation

Shigehiko Yazawa

Hideaki Yui

Masaharu Matsumoto

Hideya Toyama

Toshihide Kishida

Takashi Matsumoto

Mikio Nakayama

Yuji Maeda

Kazuhiko Ito

Takeshi Uehara

Hiroshi Ozawa

Haruo Moritomo

Tsuyoshi Kanai

Masatomo Yazaki

Toru Ogawa

Hiroshi Yamasaki

Keiji Fukuda

Yasuhiro Kajiwara

Yoshiaki Inoue

Norihiro Aritaka

Yutaka Suzuki

Yoshiharu Kano

Yoshiaki Suya

Michihiro Hamada

Hideo Tachieda

Naoto Tada

Toru Tachibana

Kazushige Haruta

Disclosed is a communication system which improves the system flexibility and serviceability by efficiently controlling presence information. A presence inquiring section makes an inquiry about a presence state of a communicating party. A presence information receiving section receives presence information. A presence information display section displays the received presence information. A presence determining section determines the presence state. A presence information generating section generates the presence information. A presence information sending section sends the presence information upon reception of the inquiry.

Communication system

A caller information display system and recording medium in a communication system in which voice communication and data communication can be done between multiple terminals over a network following an Internet protocol, includes a caller information storage unit in which caller information of each local terminal is stored in advance in each terminal, and an input unit that inputs caller information. A display unit displays caller information, and a call circuit unit controls voice communication. The display system also has a caller information transmission and reception control unit which controls transmission and reception of caller information when a call is made or received. When a call is made or received by voice communication with another terminal, caller information is mutually transferred between the calling terminal and the called terminal, and information on the other caller is displayed on the display unit of both the caller terminal and the call recipient terminal simultaneously with the callout or incoming call display.

Caller information display system and recording medium

A mobile radio telephone apparatus operating in a plurality of zones. The apparatus includes a plurality of communications devices, each assigned respectively to the plurality of zones, for establishing a wireless communications channel with a mobile terminal located within one of the assigned zones; a plurality of management devices, each assigned respectively to the plurality of zones, for radioing to a mobile terminal moving from a zone outside of the assigned zones to one of the assigned zones and for emitting position information indicating the assigned zone in which the mobile terminal enters; a register device for registering the position information; a first memory device for storing the position information; a second memory device for preregistering at least one of the plurality of zones; a process selecting device for inhibiting the management device assigned to the zone preregistered in the second memory device from emitting the position information to the register device; and a call reception control device for executing a first process of instructing the communications device to emit call reception information, assigned to a retrieved zone, while referring to the position information registered in the first memory device, and for executing a second process of instructing the communications device, assigned to the preregistered zone, to emit the call reception information without referring to the position information regarding the mobile terminal.

Mobile radio telephone for emitting position information indicating an

A mobile radio telephone apparatus operating in a plurality of zones, where each user operates said apparatus from a mobile terminal in one of said zones. The apparatus comprises P number of mobile terminals in each zone, Q number of communications connecting devices in each zone, and a management connecting device in each zone for recognizing which zone a mobile terminal is located in. The mobile radio telephone apparatus also comprises a controlling unit for controlling the management connecting device so that it operates as an additional communications connecting device in one zone, if one of the P mobile terminals generates a connecting request in the one zone and all Q of the communications connecting devices are already assigned to the other P mobile terminals.

Mobile radio telephone apparatus

A control channel junction line system for use with a digital switching network wherein a talking channel used in a control channel is used in a high efficiency is disclosed. Each exchange of the system includes a digital junction line trunk, a low rate information multiplexing trunk, a low rate control channel processing section and a multiplexing/demultiplexing section. When the low rate information multiplexing trunk is connected to a channel on which the control channel is to be carried, one of the circuits corresponding to a time slot used for control channel information is disabled. Upon transmission, the control channel information from the low rate control channel processing section and information from the low rate information multiplexing trunk are multiplexed with each other by and sent out from the multiplexing/demultiplexing section. Upon reception, the control channel information and the information the low rate information multiplexing trunk are demultiplexed by the multiplexed/demultiplexing section. The control channel information is processed by the low rate control channel processing section while the information to the low rate information multiplexing trunk is inputted to the low rate information multiplexing trunk.

Exchange connected to a control channel junction line

The relationship between wire telephones and cordless terminals are registered in a memory of a PBX. At the time of calling, when a cordless terminal is taken from the wire telephone, the wire telephone transmits a call signal to the PBX and supplies the input telephone number of the called party to the PBX. The PBX executes a calling process between the PBX and the cordless terminal corresponding to the wire telephone through a cordless connecting device, thereby establishing a channel between the cordless terminal and the telephone terminal of the called party. When an incoming call is terminated, if the cordless terminal is on the wire telephone, the PBX calls the wire telephone. If the cordless terminal is lifted by the calling, the PBX executes an incoming call process between the PBX and the cordless terminal, thereby establishing a channel between the cordless terminal and the call party.

Cordless telephone terminal controlling system

Transmitting/receiving system includes a plurality of analog junction lines and analog tie trunks provided at two ends of the analog junction lines. The PBX is provided with an analog junction line-ISDN converting unit. The analog junction line-ISDN converting unit is operative to transfer B-channel signals on a first analog junction line through the PBX network and the analog tie trunks and to transfer D-channel signals on a second analog junction line.

Transmitting/receiving system having digital switching network

A method of controlling a frame-relay module includes steps of outputting a control-information frame from a control unit connected to an ATM switch, the control-information frame containing data specifying a frame-relay interface circuit as well as a processing command, assembling the control-information frame into an ATM cell and sending the ATM cell, via the ATM switch, to a frame-relay module in which the specified frame-relay interface circuit is present, restoring the ATM cell to a control-information frame by an ATM interface circuit and a cell assembly/disassembly circuit contained in the frame-relay module, causing the specified frame-relay interface circuit to accept the control-information frame, and executing processing, which conforms to the command contained in the control-information frame, in the frame-relay interface circuit.

Method of controlling frame-relay module, and high-speed switching system

Switching system for application services

A digital telephone set includes a digital telephone circuit and an emergency analog circuit. Normally, the digital telephone circuit is made active so that a handset provided in common therewith is connected to a digital transmission line. In an emergency, the emergency analog circuit is made active instead of the digital telephone circuit so that the handset is connected to an analog transmission line. A dial key pad unit and a speaker are provided in common with the digital telephone circuit and the emergency analog circuit.

Digital telephone set having an emergency switching function and

Disclosed is a PBX system connected through a communication line (61) to an ISDN public network (101), comprising a control unit connected to a PBX switching network. The control unit comprises a unit for adding a line accessing number (.alpha.) to a calling party address (#B) in an incoming call information (ii) received through the communication line so as to form an incoming information (iii) to be received by said extension terminal, and a unit for transmitting the incoming information including the line accessing number to the extension terminal in which the line accessing number is displayed, whereby the user can recognize whether the incoming call is from the ISDN public network or from another extension terminal accommodated by the PBX system.

Private automatic branch exchange system with line accessing number

Growing community of inventors

Kawasaki, Japan

Shigehiko Yazawa