Background noise compensation in a telephone network
Background noise compensation in a telephone set
Backup battery power supply for microprocessor based telephone
Backup device for a subscriber terminal in a digital...
Balanced current multiplier circuit for a subscriber loop...
Balanced tone application system
Balancing agent console load during automated call processing
Bandwidth sharing and congestion control scheme for an...
Barrier movement operator communications
Base for telephone set, for alternative desk and wall mounting
Base plate for telephone set base
Baseband local area network using ordinary telephone wiring
Baseband local area network using ordinary telephone wiring
Bases for telephones
Battery charging circuit
Battery charging circuit for subscriber carrier equipment
Battery feed circuit
Battery feed circuit
Battery feed circuit
Battery feed circuit for a pair of subscriber lines