Office line interface circuits
Office line selecting technique of a telephone switching system
Offset down conversion for a two-handset cordless telephone syst
Omnidirectional audio in a communications device
Omnidirectional ultrasonic communication system
OmniTester
On demand call re-termination
On demand call re-termination
On demand call re-termination
On demand language interpretation in a telecommunications system
On demand real time telephone billing equipment
On hold call waiting display method and apparatus
On hook/off hook mechanism for wrist telephone
On-board ring signal generator
On-demand call blocking service
On-demand caller identification
On-demand communications services
On-demand seamless phone number updates
On-hold activity selection apparatus and method
On-hold device