Isdn adapter board
Isdn basic rate interface central office station terminal...
Isdn bri link restoration without loss of calls
Isdn call processing
Isdn callback device for testing telephone line
Isdn communication terminal and method for determining usage...
Isdn compound switching system
Isdn d channel congestion control method
Isdn d channel handler
Isdn d channel restoration without loss of signaling or...
Isdn dual bus extension phone system
Isdn fax routing
Isdn interface
Isdn interface trunk circuit
Isdn interfacing of local area networks
Isdn line circuit monitor system
Isdn network termination unit enabling to establish data...
Isdn quick connect terminating resistor
Isdn terminal equipment operating with circuit switching...
Isdn terminal system