[Asterisk-Dev] Re: STUN support

[David Beckemeyer]

Also the localnet/externip settings don't help for port rotating
NATs (I have a hard time getting NAT terminology right, even though
I know exactly what I mean :-)

Basically port-based NATs like most Linksys models (e.g. BEFSR41
specifically) will work with the localnet/externip but localnet/
externip does not solve Cone routers that do port translation/
mapping like many D-link models (e.g. DI-604 specifically). 
Asterisk simply cannot register or communciate with other SIP
nodes directly when behind such a device (i.e. without the help of 
an outside ALG or some such).