[BrianL99]

Originally Posted by feversol

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We used VOIP for several years. First, check with the Nursing home to identify how they are connecting their internet to their phone system. it is likely they merely connect their modem to their telephone jack system that all the residents plug their phone into. If that is the case, any phone (digital) that is plugged into the wall jack should work. That's how I did our home. I plugged a phone cable from our modem into the wall plug in that room which put the signal through our home. The other way, which seems unlikely, would be each resident would have a modem in their room to receive their broadcast Wifi. Each resident would then plug their phone cord into their modem. I would doubt any facility would require their residents to purchase hardware to use their system. Another way (which again requires each resident be a little techno-savvy) would be for them to use the facility Wifi and make phone calls from the residents' device that would connect to the facility's Wifi such as a mobile device or computer or even Wifi enabled cell phone.
You should not need anything of your own other than a digital phone (not a rotary) that plugs into the wall as usual. The only thing for you to undestand about VOIP is that if the internet fails, so does the wall phone.

The OP is dealing with what used to be called a "Switchboard". It's not a simple "Plug & Play" VOIP system like Xfinity or someone would provide to an apartment building. It's a "Phone System". You just can't plug any old phone into most commercial phone systems.

Internet comes from a provider, into the Asst. Living Facility's Yealink system. What comes out to the residents, isn't likely just a simple VOIP phone line. In other words, the Internet provider is not providing the VOIP to the site.