Voice remains exactly as it is now, so over copper.
The FTTC is a bundle of fibres, with the number used being down to the bandwidth rather than number of properties. With fibre you could push 100 Gbps with no problem down one fibre if you wanted to.
So from the main exchange, a bundle of fibres, with usually 1 to 4 serving the FTTC cabinet, which has electronics in it, to create the VDSL signal, which is then sent down some copper wires that link back to the old green cabinet where it is combined with your existing telephone line.
So linking the two green cabinets is a bundle of copper wires, usually enough to handle a full fibre cabinet, which is either 144 (for smaller ones) or 288 for the standard size one.