Good day all We have a 2 servers setup with asterisk, both servers got 2 network cards, public and private ips I have setup SIP on both side to listen on the private ip and iax to listen on the public ip and made the so that people can phone across. No I want o install a firewall doing MASQUERADING and only allow port 5036(iax) connection with a source of each others ip. Will this work?Or will asterisk have a problem connecting to the other users now that its being masqueraded? Thanks Altus