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In Linux is there any way to do this NATs and firewalls break end-to-end connectivity with existing package or tools?

e.g: close source cant use it for free

http://www.eyeball.com/voip-products/nat-traversal-server.htm

http://www.eyeball.com/voip-products/nat-traversal-gateway.htm

http://www.eyeball.com/voip-products/nat-traversal-sdk.htm

NATs and firewalls break end-to-end connectivity for networked applications including VoIP, video conferencing, file sharing, and online gaming. AnyFirewall Server is a carrier-grade server, based on STUN and TURN, which enables guaranteed firewall and NAT traversal for fixed and mobile applications over any network, through any firewall or NAT, and to any device.

Is there anything similar in Linux?

Reference:

samples_page.htm">http://www.pjsip.org/pjnath/docs/html/group_samples_page.htm

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jitsi can AFAIK. –  Stephane Chazelas May 26 '13 at 8:29
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