Mike -

If your router/firewall does not have any kind of SIP protocol-specific support 
then you need to set up port forwarding on your router.

Forward udp/5060 for signaling, and the matching udp ports as listed in your 
rtp.conf, to your Asterisk box. Keep the externip and localnet settings in 
place.

Depending on how many ports are listed in rtp.conf you may choose to reduce 
this range but make sure the forwarding in your router matches the ports in 
rtp.conf. Read the below links to help determine an appropriate number of ports 
if you choose to change it.

Some more information for you: 

http://www.voip-info.org/wiki/view/NAT+and+VOIP
http://www.voip-info.org/wiki/view/Asterisk+config+rtp.conf

PIX and ASA are specific models of firewalls from Cisco. They include a SIP 
protocol-specific "fixup" or "inspect" function that takes care of passing 
media through the firewall for you as long as you don't try to "fix" it 
yourself first.

sl
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