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Can I use SIP outbound proxy to bypass NAT?

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xDSL line 512kbps is a shard common line, but i can make sure it to be indirectly dedicated for VoIP by making some controls over users. For VPN setup, i'm thinking to use OpenVPN tunnelling. (with dd-wrt firmware) Thanks for introducing me about aix2 trunk, which seems better than sip trunk as you mentioned. Referring diagram in my question, i want to put sip server on LAN subnet and make 1 stage dialing to FXO gateway across public internet. Do u think this network setup can work? If I were to replace FXOgateway with GSM gateway, can i still establish aix2 trunk? sorry for the stupid questions.