Finding out if a player is using his mic

[Crow]

You know, when the yellow phone emote pops up. I need to replicate it, since I had to disable the default emotes, which disables this indicator aswell. This is no request to get it enabled at all times, I appreciate that it's gone, but I need a way to find out if a player is using his/her mic. Any ideas? I couldn't find anything.