If you have a Sagemcom router, there's a special slot on the bottom row at the back for phone, @lindarushby.
If you have an Eero, you need a digital voice adapter, which Talktalk should send out to you.
Either way, it's important that you asked for VOIP when you placed your order /upgrade for full fibre as they can't seem to add it later.
Gliwmaeden2, a fellow customer.
