| 摘要 |
A telephone system with a video camera is connected to an integrated services digital network (ISDN) via a facility (EIN). To that end, the facility (EIN), for example, comprises an audio unit (AUD1) for coupling the audio signals from the door intercommunication system to the digital network (ISDN), a video unit (VID1) for coupling the video signals from the video camera to the digital network (ISDN), a control unit (CTRL) for transmitting a request signal to establish a switched connection for transmitting the video and audio signals via the digital network (ISDN) in case of an activation of the door intercommunication system, and to receive control signals and transmit the control signals without breaking the switched connection to at least one remotely controllable unit (UNIT) and to an ISDN video telephone with programmed call forwarding. From his ISDN video telephone the occupant of an apartment is able to identify a visitor to his apartment through a video image and to activate the door opener by means of control signals without breaking the switched connection, and switch over to a second video camera and a second intercom station inside the apartment, and in this way check on the visitor even after he has entered the apartment, or communicate with him via the ISDN video telephone.
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