On-hold message updating system and method
On-hold messaging system and method
On-hold messaging system and method
On-hold messaging system and method
On-hold messaging system and method
On-hook control circuit for answering machine
On-hook customer premise equipment alerting signal detection
On-hook transmission circuit in cable line
On-line communication terminal/apparatus
On-line indicator for multipurpose headset amplifier
On-line secured financial transaction system through electronic
On-line test and diagnostic system for power system stabilizer
On-line training of an automated-dialing directory
On-vehicle mobile radio telephone with an answering function
One button control system for telephone answering device
One number intelligent call processing system
One number LAN based calendar
One number LAN based calendar
One number voice fax data PBX call discrimination
One number, intelligent call processing system