How to use Event StartCallButton

Good Day !

Is the Phonegap onStartCallKeyDown implemented ?
I Tried to use this but the Tiggzi supplied "startcallbutton" never gets fired on test phone Android 2.3.5
I also tried my own by adding.

document.addEventListener("startcallbutton", onStartCallKeyDown, false);
function onStartCallKeyDown() {
localStorage.setItem('CallTimeStart','Has Fired');

Am I not getting this?
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