I mean 8 cables. The telephone cable is not shielded and if I use 8 cables, they will not interfere with each other.
I use RJ11 with 4 wires (4P4C).
My point is that I would use an STP cable and use only 4 wires from it, which I would connect to the RJ11 connector. The only problem is that it's pretty hard. That phone cord is ideal, but I'm afraid it can handle it.