Stay where you are if
The nos that apply anywhere, fax work, a connection that drops, a live contract, shared copper and the emergency address, are on the main VoIP guide.
- You need a phone that works with the power off. The number survives a storm and calls can be sent elsewhere, but the handsets go down with the router and old copper often does not. If somebody must lift a receiver in that building days into an outage, keep a line.