Control of a calling party's telephone service features by a...
Control panel with DSL bypass circuit
Data communication device
Data request router for use with emergency public safety answeri
Data transmission apparatus for use with a security system havin
Determining a local emergency dial-string
Determining the geographical location from which an...
Device and method for article storage and release
Dial-out voice notification system
Digital control of a security system
Disaster alert by telephone system
Dispatcher-activated response identification light (DARIL) and m
Dispatcher-activated response identification light (DARIL) and m
Double annular ring speaker gasket
E-911/ALI information manager and management system
E911 backup system for emergency 911 call answering systems
Emergency alarming apparatus
Emergency alert and security apparatus and method
Emergency alert communication system wherein emergency messages
Emergency alert for voice over internet protocol (VoIP)