you won’t find the level of integration that the big ones can do once you leave mainstream Android. It leads inevitably to compromises.
There’s a small canadian company that connects regular phone numbers into xmpp, making multi device call and history possible - it’s super cool, but there’s still many gotchas. It’s not really end-user / consumer level ready and more for the tinkering / enthusiast type - here’s a review.
Over here in independent Android crowd, (older) Samsung devices struggle to even have regular voice calling (ims, volte) work with carriers.