How to know if an incoming call is a transfer?

Is it possible to know if an incoming call is a transferred call from another of our users using the webRTC phone? We saw that with https://developers.ringcentral.com/api-reference/Extension-Telephony-Sessions-Event we can check the Session Status Info reason but before we start implementing something with the subscription api, we want to see if the webRTC phone already provides us this information. Thanks in advance!