How to Transfer calls to voice mail in android?

Is there any way by which i can transfer calls to voice mail programmatically?? I am making an application 开发者_如何学Cfor android in which i will use this feature.

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Detect using: CALL_STATE_RINGING or LISTEN_CALL_STATE

However, AFAIK, you cannot make API calls to the Telephony service which will allow forwarding to Voicemail.

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You need to listen for incoming call. Disconnect the call. If voice mail facility is available on the device then it will ask user to leave voice mail.