So you and your brother/wife/girlfriend love to play FFXIV together. But the PS4 user can not connect to Voice Chat softwares that are common among the community.

You can connect as many users or headsets to TeamSpeak 3 using only 1 PC on the same client.

All you need:
-Each User will require his/her own headset. (Wireless recommended for anyone not sitting at the PC.)
-Enough USB ports to support the headsets. USB splitters do work with no interference.

Here's a quick how to tutorial: https://www.youtube.com/watch?v=JhHbZ2ew16U

There is no special installation required.
There is no additional software required.
Users are free to change channels or even change servers without affecting any other user.
TeamSpeak 3 uses very little resources and multiple connects have little to no effect on game performance.