Dial without dialer?

I am trying to write a little intercom application that will let a user press a button to be automatically connected to a number in an online phonebook.

The number being dialed number is NOT public - I do not want the user to see the number being dialed.

I am making the call using

But I still have the issue that the number dialed is visible while the dialer is onscreen making the call.

Any ideas?

PS: I already used someone's code to remove the call log thanks.

Thanks for any advice...