It probably needs to be transmitted in parallel, out of band, rather than trying to integrate it into the existing phone system. That's how Google's Verified Ca

It probably needs to be transmitted in parallel, out of band, rather than trying to integrate it into the existing phone system. That's how Google's Verified Calls thing they were touting a few years ago worked to give you context about a call by having the company placing the call relay data through Google and to an Android device's phone app with additional info like the reason for the call.