koler VS linphone-android

Alternatives: Connect You, Koler, QKSMS

Dialer: Simple Dialer (MD3) works fine. Koler (MD3) has a better UI, even than Google Dialer IMO, but it needs to have some bugs fixed and the notification runtime permission updated. Right Dialer (iOS-like/MD3) works fine too but I don't really like it; plus, I didn't compile the GitHub version, so, can't tell.

Hier is the link if somebody is interested: https://github.com/Chooloo/koler

Phone → Koler

You can request that by using Issues tab or make a pull request and implement that...

See https://github.com/Chooloo/koler/network. I don't know if any are "good", or even published though, just pointing out a feature of GitHub.

Google Phone → Koler

Add the 'phone dialler' catagory , I think the best is Koler link - https://github.com/Chooloo/koler or https://f-droid.org/packages/com.chooloo.www.koler/

Well I can tell you that any SIP program can do this, one that comes to mind is Linphone. But you do need a provider. Almost all providers deal with UDP. You might be able to find one that transmits over tcp but that’ll be a very small list. TCP isn’t reliable for VoIP, for media anyway. At best you’ll find one that encrypts the signaling over TLS, which is TCP. But audio, even if encrypted too, is done over UDP. You might have to use a provider that maybe provides WEBRTC. This utilizes VoIP over your browser, to put it simply.

Does Linphone (https://linphone.org/) not meet that need of cross platform (website claims versions for all major OS'es) and open source (https://gitlab.linphone.org/BC/public/linphone-desktop)?

Linphone is good.

Similarly, you can use any SIP (VoIP) provider (e.g. VOIPo Cloud), and configure the SIP account details in your native phone app. This way you will also be able to use a SIP softphone on your computer (e.g. LinPhone on Linux or Telephone on Mac), or even a real SIP phone in your home. Depending on your SIP plan you may or may not be able to make international calls this way.