Object-oriented configuration methods and devices for a...
Object-oriented telephony system
Off-hook detector for automatic meter reading equipment
Off-hook telephone with temporary park feature
Off-premises station line circuit for a key telephone system
Office id remote with oscillating circuit
Office line interface circuits
Offline away messages
Offset down conversion for a two-handset cordless telephone...
On hold call waiting display method and apparatus
On-demand activation of bluetooth sap
On-demand communications services
On-hook customer premise equipment alerting signal detection
On-hook/off-hook detector circuit
On-hook/off-hook status check circuit
On-hook/off-hook status check circuit
On-line call management
On-line directory assistance system
On-line training of an automated-dialing directory
One activity report for interception purposes