It can be done, I found the answer in another forum
http://stackoverflow.com/questions/5948961/how-to-know-whether-i-am-in-a-call-on-android/5949116#5949116

On Apr 13, 9:27 am, Justin Anderson <[email protected]> wrote:
> I would hope not...
>
> Thanks,
> Justin Anderson
> MagouyaWare Developerhttp://sites.google.com/site/magouyaware
>
>
>
> On Fri, Apr 13, 2012 at 5:54 AM, Rick <[email protected]> wrote:
> > Hello, I am interested in developing for Android, is it possible to
> > intercept incoming phone calls and then either allow the call to ring
> > through as normal or cancel the call?   Can this be done with
> > BroadcastReceiver?
>
> > Thanks, Rick
>
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