Conference Controls
FusionPBX Conference Controls define keypad actions that participants or moderators can use during a conference, such as mute or unmute.
Helpful articles
Configure FusionPBX Conference Controls
assigning conference keypad digits to actions such as mute, unmute, and other in-call conference controls.
Caller may say: conference controls, mute key, conference digits, default conference control, moderator controls.
Do not use when: the issue belongs to a more specific FusionPBX feature path or is outside the Applications menu.
Agent should: verify control set, digit/action mapping, profile assignment, and whether the default control already meets the requirement.
Source
https://docs.fusionpbx.com/en/latest/applications/conference_controls.html