cohens.org.il is a Fediverse instance that uses the ActivityPub protocol. In other words, users at this host can communicate with people that use software like Mastodon, Pleroma, Friendica, etc. all around the world.
This server runs the snac software and there is no automatic sign-up process.
There is a single place for all the phone stuff. I can call from the phone book. I really like it. It's a nice improvement over the combination of gnome-calls, gnome-addressbook and chatty, that are not really well-integrated.
Indeed I lost the support XMPP and Matrix that #Chatty has. But I mostly used XMPP support for notifications, and relied on #Dino anyway. And failed to use it for Matrix and used #Nheko instead.
However, what I dislike is that the code seems to be geared for internal development. The app seems to be:
https://github.com/FuriLabs/telephony
Not very inviting. No place to report bugs. I had a major problem (if I lock screen and get a call, or even dial through the command-line interface - telephony-cli, quite nice - I get a very-partially-functional interface similar to gnome calls that fails to be controlled (so mute or disabling speaker is impossible) - "libcall"(?). I ended up contacting support and sound that this is because of functionality not yet implemented.
I appreciate the FuriLabs folks very much. But I keep getting memories of Ubuntu of 10 or 15 years ago, or working on their own (even with libnih - a name that they actually used in upstart). This is a phone with its very own and somewhat different than others stack. And now it has just gotten more different than others.
Anyway, I hope it works well.