I am setting up my own "Free World Dialup"-lookalike (well, it's a handful of buddies in 3 countries as opposed to almost 500,000 users in 180 countries) with Asterisk.
So far, the phones are working as long as they have public IPs or are under a Port Restricted NAT. However, many of my users have Full Cone NAT, a problem that needs to be addressed setting up a STUN server. The FWD instructs that class of user to add this entry to their SIP phones:
stun.fwdnet.net:3478
I would like to implement such service myself. Where can I get an FLOSS STUN server??
TIA,
-Ramon F Herrera