Asterisk under NAT
From Kolmisoft Wiki
If your Asterisk box is under NAT, you should edit /etc/asterisk/sip.conf file:
[general]
externip = <YOUR REAL IP> localnet = <LOCAL NET IP/MASK>
Example:
[general]
externip = 23.45.67.89 localnet = 10.10.1.0/255.255.255.0
Forward SIP ports (UDP 5060, 10000-20000) on your firewall to this Asterisk machine.
Restart Asterisk.
Attention!
Do not put these settings in wrong place! They should be in [general] section.
Also - DO NOT CREATE THESE SETTINGS - they are already in this file.
