Okay, I think I can get my head around that, it did just take some reading up - does this mean that there'll always need to be a specific relay (or relays) available to initiate the contact between peers, or would they be able to signal each other independently after they initially male contact? 

Sorry for what probably seem like really noob questions, I'm just a bit curious and wondering how far this could go towards not needing a phone number any more.