I have a router at one side of the house. It provides WiFi for the whole house, and it works well enough. I recently decided to dump cell phone, and utilize a VoIP phone, and use as a land line. Problem is the phone would be on the other side of house, and requires being plugged into the a router. I do not want to run a phone line across the house. I would rather get another router, or a switch if posible. (not sure if a switch would work.) Anyone have any thoughts as to the best way to move forward?
Neither, you want a Powerline adapter that carries Ethernet over your power network.
If you just want to use a wired connection then something like this: TP-Link AV1000 Powerline Ethernet Adapter(TL-PA7017P KIT)
or if you want to extend your WiFi as well then you also have that as an option: TP-Link Powerline WiFi Extender(TL-WPA8631P KIT)
They generally work really well 
OK you could bridge over WiFi but I always found the above to be an easy solution.
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Well, “generally” is something that should be noted here considering powerline. They usually require to be part of same wiring, otherwise there will be problems. I would go with router but that’s of course only my opinion.
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Powerline could work well if on the same wiring. I have one in my house and it is working perfectly fine
Powerline is very hit or miss.
It depends on your wiring and your area.
Even on the same wiring, it does not work reliably in some circumstances.
@sempterobit, why not get get a WiFi voip adapter?
Alternatively, is your home not wired for phone? You typically plug the voip adapter into your phone wiring, which enables all the phone wiring in your house.
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I have personally had good results with a powerline adapter in my house and had no issues using one. However as already mentioned they are reliable or not depends on the wiring of the house, age of the wiring, how the circuits are set up.
For me I had issues with one manufacturer of powerline and no issues with another, my TP-Links kept disconnecting all the time unless I sent a continuous ping through them 100% of the time, with Devolo these have worked with no issues despite being on the same circuit, so they can be hit or miss even between manufacturers sometimes.
Regarding my home situation, I would have personally drilled holes or routed my own cables but not easily possible since the landlord of the property won’t allow it.
WiFi voip adapter could work as Dalto said. There is a possibility the VoIP phone you have can possibly connect via WiFi itself although I wouldn’t know the reliability of that, we done this in some areas of my company but corporate network and WiFi is different scale to home WiFi and had access points everywhere for good connection.
The switch and the router are for a different purpose in the network. The switch is working on level 2 (MAC address) and the router on level 3 (IP address).
If you do not want a wire connection and the signal on the other side of the house is too weak then you could use 2 wifi routers as access point and a station creating a single network. Or you can look at wifi extenders/repeaters (they are sold as dedicated devices or you can sometimes repurpose the wifi routers).
Powerlines just tries to push the signal over the mains wires which can save you some masonry work but I personaly do not trust it (my paranoia asks what else is connected to that network).