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A system component providing a call button used to alert a master control station operator of a person requiring assistance, capabilities providing hands-free two-way communications between the person and operator, and visual indication of both call activation and active two-way communications. (SIG-ECS)
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Related Code Sections

24.10.12 Emergency Communications Systems (ECS),
The remote call stations shall provide for hands-free, two-way communication and provide an audible and a visual signal to indicate communication has ...
24.10.9* Emergency Communications Systems (ECS),
The physical locations of the remote call stations and the master control station shall be as designated by the building code in force and the system ...
24.10.8 Emergency Communications Systems (ECS),
Two-way emergency communications systems shall have the capability of transmitting a verbal signal to identify the specific building address to off ...