Drags you the telephone line between the junction box of the Telekom and splinters by the "APC Back UPS" (mind you using two ADAPTER TAE-F to RJ11 and RJ11 to TAE-F, which are not included, because the device does not seem intended for the German market is), there remains indeed receive the DSL signal; However, it has also a conventional telephone or ISDN connection, the phone signal from unknown reasons lost (in a replacement unit came the same error).
The APC Customer Support is a catastrophe: The e-mail or "live chat" -Kontaktmöglichkeiten are unavailable. Under the telephone hotline login always very friendly ladies in a call center somewhere in a distant land, from the problem (the devices?) Understand nothing, but promise a response within an hour - THE NEVER DONE !!!
Although the emergency power supply works (over the life of the backup battery, I can take no statement); but as an essential function of the device is not available, there are of me just a deficient.
By the way: he who seeks only a surge protector for phone / DSL connection is with the "revolt 6in1 Surge protection for TV, HiFi, LAN & Telephone" by Pearl for more than EUR 10 best served. Connected between wall socket and splitter, the signal will remain here!