UTP RJ45 to RJ11 4Port Multiplier Voice/Token Ring to RJ45 Voicemail

Did not work, no diagram of pinout

LAYMEN BEWARE: The single 'male' end did NOT fit into the phone wall socket as expected, a bit too big: fits an ETHERNET socket. The other ends, DID have the appropriate phone size. I had thought THIS a basic landline accessory, a standard size, so be informed. Sadly, i must return it.