A lot of our users use some form of an Silent or AFK (Away From Keyboard) channel, that mutes the Teamspeak 3 client so users in the AFK channel cannot disturb others in the channel.
To create a channel like this, just make sure when creating the AFK channel to set the "Needed talk power:" to 999 or any value above the talk power of your highest user, or the highest level of user you would like to have talk power. By default Server Admin's have a talk power of 75 we suggest setting the "Needed talk power:" to 74. This means that no one in the server can talk in this channel except for the Server Administrators