how to cancel/hide the Incomming call intent android

Friends

I wanted to know is there any way i can check for in开发者_如何学运维coming call in android?

I also want to know if there is any way to cancel the Intent to show the incoming call?

If really we can cancel the Intent of showing incoming call then will the caller get ringing or get busy tone?

UPDATED:

May be i can not cancel the call but is there any way i can hide the incoming calling intent to be displayed to the user screen?

Please friends Guide me for these issues.

Thanks in Advance

You can detect incoming and outgoing calls.Check this link -

But I'm afraid you cannot cancel an incoming call using the standard API available mainly due to security reasons.