SocialSharing-PhoneGap-Plugin VS linphone-android

With Appery.io, you can significatly simplify integrating the Social sharing feature into your mobile app and involve a wide audience by adding Cordova SocialSharing plug-in. And the beauty behind it is that creating such an app is just a matter of several clicks!

Good news, my friend: https://github.com/EddyVerbruggen/SocialSharing-PhoneGap-Plu...

used this one but for capacitor https://github.com/EddyVerbruggen/SocialSharing-PhoneGap-Plugin#5-web-share-api It is pretty decent

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.