There are no free assets for VoIP it seems :/. isn’t there a way to connect a microphone with a audio source to get direct voice communication (like when people talk to eachother not the complete world can hear them) (or like in rust,dayz etc.)
There are free assets on the Unity asset store that deal with VoIP. I am a co producer of " Mic Control " on the asset store. It can be used with VoIP. The Mic Control asset script uses an audio source, so you can change the range people can hear you at. It’s FREE on the asset store. It is also located on the Unity3d Wiki