I've dug around and can't seem to find a real definitive answer to these
questions... sorry if they're answered elsewhere.
Does jigasi depend on an external service for NAT traversal?
As an alternative, is there a property that can be set to give jigasi an
external ip to use as it's "advertised ip" in SIP contact/via headers? It
looks like there may be in jitsi, but I don't think that extends to jigasi.