The best: it works with the Speedport 921V Telekom

Until today I did not know what IQ means Cat 2. If you put the latest telecom router, is something important. Why? Because my cordless phones Speedphone 300 and Fritz! Fon MT-F suddenly calling! Just as great-grandmother's time. No phonebook, caller list, ..., nothing more. But this Panasonic Low Budget Phone seems to dominate the said standard. Fortunately! At least is still a phone book with our contacts there. I now order a second Panasonic. According to the manual, and a menu item in the handset, you can transfer the phonebook then.
As a secondary phone for less frequented rooms in the house, the Panasonic TX-TG2711GC is sufficient. Pleasant ringtone, good communications and rich reach me here.