Once I needed a new modem (splitterless connection of the Telekom), I bought this cable as an adapter between the telephone socket (RJ-45) and modem (RJ-11). This adapter cable can be also great to use for wiring of an analog phone in the new building. This makes it easy to transmit the signal of an analog telephone possible via a network cabling (Cat5, Cat6, or Cat7 Cat7A). Simply snap on both ends of the connecting such a cable and you're done. Can only recommend at this price the cable.