The VOIP should have a keybind or setting which allows you to hear out-of-party chatter and party chatter at the same time.
There should also be a keybind which allows you to switch between talking to out-of-party people (anybody near you) and talking to just your party.
This would make the world more lively and make wars/outpost rush make more sense. Potentially disable talking to the enemy in outpost rush to prevent toxicity, but please allow us to easily talk to other groups/people near us. It is very awkward not being able to communicate to anybody except for the 4 other people in my particular group.