Stay where you are if
- Your line drops, even occasionally. Voice needs steady more than fast. Test video calls at your busiest hour, from where the phones would sit, before you order anything.
- Winter outages are part of your year. No power means no router and no phones, while a corded copper handset keeps working. That gap needs a forwarding rule agreed in advance.
- A fax machine carries real work. The tones a fax sends were meant for copper and arrive scrambled once they have been data.
- Emergency calls need a correct address. The number goes with you, so the address held on the account is the one dispatch is given. On a remote site that is a safety task, not a setup step.
- Something else rides on that copper. Alarm panels, gate phones and older card terminals often share the line.