DIY cable modem Fritzbox analog

I have with this adapter and a telephone cord ([...] Technically, would a 2-pole enough but 4 wires give more support than just 2) a separate adapter cable built by the analog telephone output of your cable modem to the Fritz box to loop WITHOUT the AVM-Y cable + TAE-RJ45 adapter + TAE-RJ11 adapter. Unfortunately there is no such cable ready to buy (market niche?) Because of the exotic occupation the AVM-Y-cable.

(You have to set! The outer two wires I connected to the contacts 4 & 5 of the RJ45 adapter but are anyway the middle 2 wires on the telephone jack on the contacts 3 & 6 of the RJ45 adapter not required)

For a plug I wanted no crimping pliers + 10 (0) erPack RJ45 plugs so I buy one of these Telegärtner ordered RJ45 adapter - and it has a little fumbling ('m not a craftsman) but works quite well. Calls on my DECT Phone Fritz is fine and I have no more loose contacts.