Abstract: The computer controlled communication system has communication devices (KE1, . . . , KEn) and has data devices (DE1, . . . , DEn) that are connected to a network server (SR) via a local network (LAN), of which devices at least one communication device (KE1, . . . , KEn) and one data device (DE1, . . . , DEn) are respectively associated with a user and are functionally coupled in order to fulfill technical communication performance characteristics. Via a technical communication interface subassembly (VBT), the communication devices (KE1, . . . , KEn) are connected to the network server (SR), which is connected to an open or private switching center (PBX) via a transit switch (ISDN-A/Q), which network server has a gateway (GW) to couple the local network (LAN) to the communication network (ISDN).

Abstract: Key telephone system with a private branch exchange that includes a switching unit, stationary key terminals, and at least one of mobile cordless and GSM terminals. The switching unit is adapted to switch calls to the stationary key terminals and to the at least one of the mobile cordless and GSM terminals. The system also includes a first trunk group and a key server system, in which the stationary key terminals are coupled to the switching unit through the first trunk group and the key server system, at least one additional server comprising a memory unit, and a second trunk group having lines associated with each of the at least one of the mobile cordless and GSM terminals.

Abstract: The communications system has an ISDN central switching station (VSTa), to which at least one special-purpose terminal device (SE) provided with electroacoustical transducers (MIC, LS) is connected and with which a mobile set (MT) is associated. The special-purpose terminal devices (SE1, . . . , SEn) are provided with a processor (MP) and a switching unit (SWUe), by means of which a connection between a terminal device (EGx) and the mobile substation (MT1; MT2; . . . ) associated with the special terminal (SE1; SE2; . . . ) can be switched through. To set up a call from the mobile set (MT1; MT2; . . . ) via the switching unit (SWUe) to the terminal device (EGx), target addresses of the terminal device (EGx) are transferred to the special-purpose terminal device (SE1; SE2; . . . ), so that the special-purpose terminal device (SE1; SE2; . . . ) is suitable for extracting this information and switching the connection through.

Abstract: Subscriber stations in a telecommunication system are selectively connected and controlled by an exchange having a central control. The subscriber stations have operating conditions varying from an idle to a start condition and from a captive to the idle condition. Line connection circuits of the subscriber stations issue a signal indicative of a transfer of any subscriber station from the captive to the idle condition. Circuits common to the subscriber stations but separate from the central control monitor the subscriber stations as to the issuance of a signal indicative of a transfer of a subscriber station from the captive to the idle condition. Circuit components common to the subscriber stations and connected to the monitor circuits ascertain the particular subscriber station for which an indicative signal has been issued and carry out a release of the particular captive condition.