I am a trained IT Systemelektroniker Telekom.
Nevertheless, I have as Telekom "employee / customer" is Speedbox returned and bought rather a Fritz box. By design, the then largest of AVM.
I also have experience with the Unity Media unit of AVM the 3xxx Cable.
So let's start calling again on the negatives.
The phone has many dropouts (but is rather poor at the Telekom line!)
Likewise, it is not possible times to activate a "night service" sodas ringing the phones time to time times only in 10% volume. Would be nice so not wiedermal anyone thinks a by 6 clock to throw up in the morning but that's the awake already missed by the ringing phones.
Otherwise, I am very satisfied. That is what wireless is very strong and the DECT function is also to even the Borrow the chance to easily connect the phones.
Unfortunately, there are more and more attacks on Fritz box so my most important advice always keep the firmware currently or there is a nasty surprise!
All in all a great router of EDR Hardware ago !!!!! However, the software might be something for the ausgerifter but still quite high price.