You can set global preferences in the js/presence.js file.

var showLines          = 2;
var notifyDuration     = 6;
var warnClose          = true;
var dynamicLineDisplay = false;
var soundChat          = true;
var soundQueue         = true;
var soundRing          = true;
var displayQueue       = 'max'; // max or min
var pdateFormat        = 'ddd, HH:MM';
var disableVoicemail   = false; 
var language           = "en";
var voicemailFormat    = "wav";

var dynamicLineDisplay = true;
var displayQueue = 'min;