I doubt it. I have my cell phone as my main account number, but I have my 942 plugged into a Sipura box using a number that's not the same as my cell number. I see the receiver calls in and I've never been called on it.
I installed a 522 with a wireless phone jack for a customer 11 months ago. He gave me his cell phone as the home phone number on the account. I realized this when I added a 411 to his account two weeks ago. He double checked his bill. No problems.