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Can I use SIP outbound proxy to bypass NAT?

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Sip server i used is based on asterisk (PBXinaFlash) and in local network. Can PBXinaFlash perform NAT traversal? Do you mean VPN solution can solve both NAT issue and ISP firewall problem? Internet connection is slow (512kbps) at one end (PSTN side) so will there be voice quality problem considering encryption/decryption nature of vpn method? and tks for sharing the links.