So to the phone:
It is true as noted many other reviews you can call as with (almost) any other DECT cordless phone also.
However, there are many "addons" that make the device so unique great. Because I want a technology freak not only calls
but, for example, want to know when an email arrives to have run without the computer for with Spanish friends via SIPS
want to call cost or the 2 devices "abusing" as a high quality baby monitor. Since the phones can also connect via Wi-Fi
(SIPS telephony) and I to FritzBox 7270 have in addition the Fritz repeater in use, the range increases tremendously!
A shared phonebook (you save the number to a telephone and is automatically available on all phones indoors), Call Management
(Eg all calls after 22 clock only on a specific phone or even completely silent) and and and .....
Clear to use all these things to you should in addition to this phone also at least the Fritz box call his own.