I'm pretty sure Whatsapp/Facetime is P2P for video calling. But I'm not sure about a video conferencing solution i.e. a multi-party/group call. I have a service that sniffs packets going in/out of my home network which maps the remote IP to a registered ASN and the Lat/Lon coordinates. All of my Whatsapp sessions have been tagged with the name of the ISP at the other end and the right position coordinates. Not Facebook's/Apple's.