I'm trying to replace my 302A&B console with an 8434DX. I really don't need any of the console/attendant features. I set up a new ext. (XXXX) with the 8434D and I can point all outside calls to it by changing my trunk group. Problem is my dial 0. When I look at dial plan it shows 0 first digit as attd. I can change it to extension. Question is where do I enter the new extension number?