Possible: to locally convert a cell phone or landline call’s audio into a voip call so it becomes a (same platform) voip to voip?

A call to a ring central US number that is answered by an overseas agent is far inferior in call quality to an international whatsapp to WhatsApp or skype to skype call. Is there a solution that can convert the local call locally to then stream whatsapp to WhatsApp? So tired of these “phone number-voip” companies. Ring central 8x8 VONAGE all have been a shell of what a whatsapp or telegram or facetime audio call is. What gives?