You need to future proof for medical devices, take it from me. When my dad was in the last years of his life we had all kinds of medical devices around that needed phone lines. Luckily when the house was built in the mid 60's ATT encouraged that massive bundle of wires, there might be 12 pair, and it is run next to EVERY electrical outlet in the house. I made use of that feature any number of times as things changed. Most used FAX like communication and could be quite picky in sending. Run an extra set of something to the areas the older folk will occupy, you never know.
As I mentioned my house was built in the 60's, it's two story, about 4000sq. ft. Over the years I've fished what seems like mile of CAT5, I would never rely on wireless. Home runs from each room should not be that difficult in the building stages, you can easily add a switch if multiple connections are needed. My media area has an 8 port switch, my bedroom and library have 4 port switches and I have 16 port by my computer. Everything that can be hard wired is, and that is the only way I'd do it.
BTW there are much better and cheaper alternative to Vonage out there. Used Vonage in our office for a while, total rip off.