@Edent
I explored this as well for my contacts page. I ultimately opted for WEBRTC which will work for most any browser. Both Webcall https://f-droid.org/en/packages/timur.webcall.callee/ and Nextcloud Talk are free options for providing a link that will call my phone with no additional SW needed on caller's end. WEBRTC is also more secure and private, but it may lack the features of caller ID and voicemail. WebCall | F-Droid - Free and Open Source Android App Repository