This is a simple plugin allows you to mute all the players on the server with the exception to the players that you voice, and the players that have the override permission.
/servermute - Mutes or unmutes the server.
/voice <player> - Allows the player to speak.
/devoice <player> - Stops a previously voiced player from speaking.
/servermute - servermute.servermute
/voice - servermute.voice
/devoice - servermute.devoice