One number lan based calendar
One touch areacode dialing
One-button intelligent cti dialler
One-number communications system and service integrating...
One-way buffered communicator
Open loop system for transmitting digital information
Operating a communications network
Operating device for push button-dialled telephone
Operator assisted call subscriber screening using an...
Operator communication arrangements for operator assistance...
Operator services using speech processing
Operator supervisory circuit for a key telephone system
Optical switch for headset
Optical transducer
Optimization of telephone outbound calling systems
Optimized baseband processing for cellular modems
Optimizing the capacity of a telecommunication system
Option bus
Order wire alarm and control circuit
Ornamental telephone construction