I have an Asus N16 running ToastmanTomatoUSB and entware asterisk on a thumb drive. I have configured asterisk so that it works for calls within the LAN (using 192.168.1.1 as the SIP server address), and calls can be sent out to VOIP providers, but they can't come back in (incoming calls). When I did an external port scan, it shows 5060 as timed out. I was wondering if this could be a firewall issue. My goal is to place asterisk in front of the NAT so that it sits right on the internet and also accepts connections from the LAN. I can't use port forwarding because I want it in front of the NAT. Any idea? As you can probably tell, my linux/asterisk experience is minimal. Thanks in advance.