Android :: Android: Ringer Mode Changed To Silent Doesnt Stop The Phone Vibrating

I'm trying to change the ringer mode of the phone to RINGER_MODE_SILENT when a call is incoming by using the following lines of code.

CODE:...............

While the phone stops ringing it continue to vibrate although the documentation of RINGER_MODE_SILENT says it should also stop vibrating.

I'm using the SDK 1.6

UPDATE:

As I didn't find a solution yet, I tried to deactivate the vibration settings manually.

am.setVibrateSetting(AudioManager.VIBRATE_TYPE_RINGER, AudioManager.VIBRATE_SETTING_OFF );

But this also doesn't prevent the phone form vibrating when a call is incoming.

UPDATE 2:

Today I tried to solve the problem by canceling the vibration via a Vibration object.

Vibrator vib = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE);
vib.cancel();

Again, without success. Now I'm running out of ideas and asking myself if it is possible to stop the vibration at all.

UPDATE 3:

I've discovered another interesting fact when I've reread the documentation of the Vibrator class. The documentation says:

"If your process exits, any vibration
you started with will stop."