you might reference this  Why it is impossible to intercept incoming
calls on Android
(http://blog.wangling.me/2009/08/why-it-is-impossible-to-intercept-incoming-calls-on-android/
)

but I did not verify the correctness of the content.
IMHO, you have to refer the "call barring" related feature.

2010/2/1 saru <sarucs...@gmail.com>:
> Look i need to develop a dialer software(in android-OS) where i need
> to catch different calling features.So far i get notices of incoming
> call, outgoing call and different call state.
>
> But what is needed to me are
> * my application can receive the call(Accept button in my application)
> *my application can reject the call(Cancel button in my application)
>
>  before posting here probably i searched every where in web but
> failed.Please if u people out there have any idea how could i
> implement accept and reject button in my application please let me
> know.
>
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