ISDN telecommunications exchange and subscriber terminal
EP0901304A2
ISDN telecommunications exchange and subscriber terminal
EP0901305A2
ISDN telecommunication exchange and subscriber terminal
EP0796028A2
Telecommunications exchange
EP0796029A2
Interface transducer
EP0796030A2
Telecommunications exchange
DE19543038A1
Network termination device for ISDN telecommunications system
DE19543040A1
Incoming telephone call signalling device for ISDN system
DE19538527A1
Network terminator for ISDN telecommunications system
DE4409670A1
Personal Computer keyboard with built-in telephone
DE4409669A1
Adapter for connecting at least one analog telephone device to a digital telephone network
EP0599442A1
Private branch exchange
EP0579345A1
Door telephone
DE4133147A1
Telephone device
DE4133148A1
Communication terminal
DE4133149A1
Telephone device
DE4100722A1
Changeover switch for telephone appts. - uses bistable relays associated with each telephone handset for selective connection to common telephone line
DE4009487A1
Telephone peripheral device - provides alarm signalling with switching of multifrequency selection coder to alarm signal tone mode
DE3937621A1
Telephone exchange with distributed processor systems - provides multiple plug-in positions to enable connections to bus systems
DE3925497A1
Second branch office equipment with control sequence memory - in which procedural information is addressed according to signal combination with different equipment and function criteria
