I had to disable voice on GunGame.
People are abusing voice as radio station.
This produces a lot of traffic.
It can cause lags too.
And it also affects all other game servers running on the same machine.
Because it steals bandwidth and CPU power.
Furthermore many people argued that this audio spam is affecting the gameplay a lot.
You cannot hear the zombies etc.
Use your own mumble or Teamspeak if you want to play music for the other guys.
You may register here on the forum and ask for a mumble account for normal chat (no radio).
Maybe you can get an account then.
Update:
Vocal chat is activated again.