Abstract: A video conversation/monitoring system having a remote monitoring function includes a center station and multiple end stations linked through the ISDN network. The center station includes a video conversation/monitoring circuit, video input device, video output device, audio input device, audio output device, system controller, facsimile, and ISDN line terminating unit. Each end station includes a video conversation/monitoring circuit, system controller, first video input device, second video input device, audio input device, audio output device, calling device, first notification device, second notification device, detection device, facsimile, and ISDN line terminating unit. Based on the remote monitoring function of the video input device and the remote control function of the system controller for switching the video input device, various guidance services are accomplished in addition to the video-phonic conversation service.

Abstract: A video conversation/monitoring system, having a remote monitoring function and a remote peripheral device control function in addition to a video-phonic conversation function, includes a center station linked to multiple end stations through an ISDN network. The center station includes a video conversation/monitoring unit, a conversation camera, a monitor screen, a conversation microphone, a conversation speaker, a system controller, a facsimile, and an ISDN line terminating unit. Each end station includes a video conversation/monitoring unit, a system controller, a monitoring camera, a conversation camera, a conversation microphone, a conversation speaker, a sending key set for making calls, a first notification device, a second notification device, a detection device, a facsimile, and an ISDN line terminating unit.

Abstract: A videoconference device connected to a general commercially available facsimile unit and having a function of sending/receiving a facsimile signal during communication.

Abstract: A communication system having an exchange network which can execute a communication procedure necessary for setting of a communication bandwidth with a party variable bandwidth terminal to make the most of characteristic of a terminal which can change its communication bandwidth during communication and to obtain as many call interconnections as possible. The exchange network includes a variable terminal attribute memory device for storing therein the types and ranges of variable bandwidths of the terminals, a bandwidth decision device for determining bandwidths allocated to the respective terminals, and a control data communication device for transmitting at least an allocated bandwidth data to the associated terminal.