My 622 is causing tons of interference in our phone line, so we cant leave it hooked up and therefore have to pay extra fee for it. I'm going to request it get repaired, however I am wondering if it is reasonable to expect an exchange with a 722 (most likely at my request). Is this something that any of you guys have been successful with in the past (i.e. without paying for it)? If not, what is the going upgrade price? Thanks in advance.