Voice Loops (VIS)

[Tunefix]

Possibility to connect to a voice-service to enable voice loops with a SMEK-panel

[Tunefix]

From ArsTechnica:
The PABX modules were central to each controller's job. The ones in MOCR 2 today are mostly early Shuttle-era, but during Apollo they consisted of an array of paired buttons, with a yellow and a white button for each of the available communications loops. Pressing a loop's yellow button allowed the controller to listen in on the loop, and pressing the loop's white button raised its volume slightly and allowed the controller to speak on that loop as well.