If you're going to use a landline then it could easily be Digital Voice in which case you must use the SmartHub 2 that'll be supplied.
I've had to do that but the SH2 just handles the DV side of things and my Asus DSL-AC68U does the rest.
You could do the same as it's quite easily done and both @licquorice and myself can give you guidance on doing that if you wish. Could save you getting any more equipment.