[asterisk-users] SIP URI question and NATs

[Robert Moskowitz]

I am seeing slight differences in URIs.

In the case where things work, the URI is user at sip.foo.com  where it 
does not work is user at sip.foo.com:5060

In the first case I suspect that Asterisk did something, perhaps at 
startup, where it 'decided' it was behind a firewall, so let the 
firewall do the port mapping.

In the second case I suspect whatever Asterisk was doing at startup 
indicated it was wide open so it supplies the 5060 port number.

Is Asterisk doing any discovery at startup?