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VoiceActivity

VoiceActivity is a very simple addon (there's 1 script and it's 9 lines) that makes every player have their microphone on constantly, allowing you to speak with others without holding the Push To Talk button.
Primarily designed for Sandbox but other gamemodes may work too.

Voicechat UI can be a bit annoying, you can use this addon to disable it: https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=2611557262