I have implemented app to app calling & app to phone calling using but How can i use phone to phone call feature using sinch sdk. I have seen this feature in REBTEL app as local call setting. i can not find any tutorial related to this on sinch official website.
you rent a couple of phone numbers set up the callback url, on your server side you then prep the system so if you get a call on number A connect it to number B. There is a tutorial for it here https://www.sinch.com/tutorials/keep-users-phone-numbers-private-uber-x/