HomePhone will not work with Nighthawk AC1900 D7000

Look, I don't want to belabor the point, but you do NOT understand your Phone system. You are CLEARLY using VOIP... that means the Modem/Router MUST have an eMTA as well.

You can NOT tell the difference between a VOIP phone and a Landline. They both sound and operate the same way. Just that a Landline goes via cables all over the place that are strictly for phone/voice service. VOIP phones have an eMTA that translates voice to digital and it is sent over the Internet to some station local to where you are calling back into voice and completes the call.

You said it worked with this Device, Modem/eMTA and from spec's:

Supports VOIP Calls: Simply make or receive phone calls over the Internet

Why? Because it has the PROPER Phone jack on the back.

D7000, Datasheet, do you see anything about a phone or VOIP or eMTA on it? NO!!! That is why it WILL NOT WORK!

Want Netgear, a C500V or a C7100V but be careful, they may not work with your ISP?

I suggest you go back to the workers at JB-HIFI educated and ask for a modem/router that supports eithe Voice, eMTA, or VOIP with the phone jack on it.

Your other choice, keep what you have an buy an eMTA standalone that you plug the phone into and that into your router's wired port.

Note that some ISP's severely limit what you as a user can connect to their network. Best to check with them before doing anything.