Alarm system backup with cut line detector

Alarm system for enclosed area

Alarm system having bidirectional communication with secured are

Alarm system using local data channel

Alarm system utilizing wireless communication path

Alarm system with interconnected alarm terminals

Alarm-responsive apparatus and method

Apparatus and method for E911 detection and callback monitoring

Apparatus and method for identifying a calling station

Apparatus and method for intelligent call routing and call...

Apparatus and method for intelligent call routing and call...

Apparatus for locating a station initiating transmission of...

Apparatus for locating a station initiating transmission of...

Apparatus, and associated method, for facilitating routing...

Architecture for robust voice CTI

Arrangement for communicating between public safety answering po

Arrangement for obtaining information about abandoned calls

Arrangement for public safety answering points

Assisted personal communication system and method

Audio/telephone communication system for verbally handicapped