708.1-4 – Two Way Communications

708.2 Audible and Visual Indicators.
The system shall provide both audible and visual signals.

708.3 Handsets.
Handset cords, if provided, shall be 735 mm (29″) long minimum.

708.4 Residential Dwelling Unit Communication Systems.

708.4.1 Common Use or Public Use System Interface.
The common use or public use system interface shall include the capability of supporting voice and TTY communication with the residential dwelling unit interface.

708.4.2 Residential Dwelling Unit Interface.
The residential dwelling unit system interface shall include a telephone jack capable of supporting voice and TTY communication with the common use or public use system interface.