I'd recommend a cordless phone with the extra handsets.
Using your phone jacks/house wiring is possible, but it's risky unless you know exactly what you're doing with it. If there is ANY current at all from the phone company running through the lines, it will fry the VOIPo adapter.
We see a lot of customers connect the adapters to the wiring thinking that since they don't have service with the local phone company that there would not be anything running through it and then contact us when their VOIPo adapter stops working.
Even if you don't have DSL or service from the phone company, there is likely current still going through it. In a lot of areas they have to do that so that if it's connected, 911 calls will go through even if you don't subscribe to their service and it's also how they can turn service on so quickly (pre-wired so they just do it in the central office).
If you do decide to go the wiring route, the key is that the phone company's connection outside is completely removed so there's no chance of anything going through it.
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