Is it possible to make phone calls in background?

I'm programming an Intercom App. My idea is to have in the lobby of a buiding an enclosed phone with a screen similar to a phone application. But instead of entering the phone number the user enters the number of the apartment and the app search for the phone(s) number(s) in a table apartment-phone and make a call...

So far so good...

My problem starts when the app makes the phone call it opens the "Phone" app in the phone and the "real" number of the person livin in the apartment shows in screen... and that is a security issue!!!!

Is there any way of make a phone call without exit from my app? or make the phone call in background?

this is a real security issue!!!!

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