Windows Phone "how to make a Call without permisson from user"

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Mobile

Windows-Phone-7

, +

hi every one;

I need to develop an application which has to make schedualed calls. The problem is it must call without permisson from the user. Also, it must end the call after sometime. Therefore i cant use PhoneCallTask. i heard about Microsoft.Phone.Media.Extended.dll and Microsoft.Phone.InteropServices.dll to use more features of the phone. I downloaded them but i could not add them as referance to the project in visual studio. It says "A referance to a higher version or incompatible assembly cannot be added to the project."

My question is that is there any way to implement such a functionality ("call without permission and end call without any interaction with user." )?

I tried to trigger click event in the shown Meaage Box when we try to call somewhere. However i could not doo it too.

Good news is i will not upload it to the store... It means i do not need it to be certified... Thanks...