Hams Over IP VOIP Network (they style it Ham‘s Over IP VOIP Network) is out there.
https://hamsoverip.com/
Not much written about the background on the HoIP website and wiki (linked from the website).
More than a one person exercise? Not certain. Something different than Hamshack Hotline.
Much seems to be on the insufferable Discord platform rather than static webpage documenation.
73
Steve
K9ZW
With Varying Frequency - Amateur Radio Ponderings 
HoIP login page a major pain (as I never did get to sign up to investigate further). A month ago I sent HoIP a ticket – hearing nothing back. HoIP has put the definition of ‘Amateur’ back on the books.
Just found this: https://www.youtube.com/watch?v=hU2xum8lEp8
I’m NOT eager to join HoIP as HH has been a bore. In 2yrs of HH I’ve only had three (non-family HAMs) call me via HH.
HH has great audio quality but with HAMdom fading away why would I want to get into another VoIP-HoIP service with all the learning/programming/purchasing pains a new Service will require?
Getting HoIP information is too much a pain in the b*tt for me to expend energy upon. And the SAME issue prevails – if an EMP happens the Internet is dead like these services. A radio will be of real use when the web/cell go dark.
I do not have the time at the moment to dig into HoIP much less do a A/B comparison with Hamshack Hotline vs HoIP.
Though I have had some non-family Hamshack Hotline calls, I am not that often physically in the hamshack. I have used it to stream “Coast to Coast” though. Always a fun listen.
73
Steve
K9ZW