Communication & Security Systems, Building Security, Control Room Systems, Intercom, PNA, PSA, VoIP, Evacuation-, alarm, and elevator emergency management and call systems, communication devices for security zones (point to point voice connections), door communication, radio conference call systems, counter two-way intercom systems, intercom and security systems, nurse-call systems, paging systems, fire alarm informer systems for the deaf and hard of hearing, integrated messaging systems