More like a cordless telephone or intercom?
VoIP Phone.
For Wifi is no Typical Radio. In theory are some Standards who would allow to do this like what some "Social Groups" here in Europe do. The put an special Linux "Firmware" on some Open Router.
The use some Mash Network where the Router search for other Router and Connect to them.
So if you would find some Chinese Company who make an Radio/ Phone with it would work.
The Icom Stuff is (for me as an IT Technician) nothing else than an fancy VoIP Wifi Phone.
The Problem is in many case you need additional Software licence for Wifi Phones / Radios.
Here in Austria its very hard to get an Radio legaly licence. You must buy it from an "licence" Dealer who register it at the officials. You can believe you pay much more for the Radio you have to.
Here everyone use Dect Systems or Mobile Phones.