I want to use STUN as a primary nat solution, with the nathelper or mediaproxy module doing rewrites as a secondary/backup solution.
However, this will not work for symmetric NATs. I want to proxt the rtp data from these (and only these) kind of nat. Can SER determine that?
My client adds a Warning: 399 spa "Restricted Cone NAT Dectected". Header to the register message (determined by stun), but that looks proprietary and not something I can expect to be the same from other clients so I'm not sure I want to header match on that.