I have a Philips CD 655 cordless phone that came with a second receiver that sits on it's own base (with out answering machine, only power). I've moved to a house with 3 floors and would like to know if it's possible to buy a third receiver (also without answering machine base). I don't want to have to buy another whole phone. If it's NOT possible, would another cordless phone work with the ones I already have? Thanks.—Lynne Waring