Voip question.

How does VOIP work in this game? Looks like it’s OFF by default for everyone. So if i turn it on, but all my squad mates have it off, it won’t work. 
In previous titles it was turned on by default so everyone could communicate and if you had the odd person with blasting music or being toxic you could mute them. So can someone confirm it’s the opposite way right now? I am trying to talk to squad mates, asking for revive, ammo, pick me up with the heli etc. but nobody is reacting. No sense having VOIP if it is OFF for everyone by default and they can’t hear me.