Just a warning, TT Systems made the IBM 2.4GHz cordless phone that I bought from Amazon and its horrible. Half the time you either can't get all the numbers to dial or you have to press them repeatedly to hear the tone meaning it went through. If you can get the number dialed then talking on it is fine. The IBM looks similar to this phone except it has a display and its black.
Of course, I have 3 2.4 GHZ phone and my luck has been terrible. My IBM can't dial all the time, my Panasonic gets Out of Range errors all the time, and my Uniden's "part you talk into" only works when it wants to. Maybe they should all merge and make a phone that everything works correctly on!