Hi, I have long time messed with SIP and NAT, funny no docs out what say if you have for example symmetric NAT SIP won't work.
But now middle of completing STUN client i see how each NAT works. For normal operation of SIP there must be: public internet,full cone nat,restricted cone nat. symmetric and port restricted won't work - only is b2bua. Does that mean b2bua is only SIP proxy what can be used in real life, i looked most routers are port restricted or symmetric ? What problem is with port restricted for example: (UA2 is port restricted) UA1(invite) -> Proxy -> UA2 All ok UA1(ACK) ------------>UA2 ACK is sent directly but UA2 never allows data from UA1 because UA2 haven't sent data to UA1. _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
