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Building Telephony Systems with OpenSIPS 1.6 by Flavio E. Goncalves

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Solving the SIP NAT traversal challenge

The solutions for NAT traversal could be classified as near-end, such as Simple Traversal of UDP through NAT (STUN), for solutions implemented on the client-side and far-end, such as Traversal of UDP over Relay NAT (TURN), for solutions implemented on the server-side. The far-end solutions are easier to manage and solve NAT traversal in all four types of NAT devices. However, these solutions impose a scalability penalty, thus forcing the RTP media flow into media relay servers. Near-end solutions are harder to manage and can solve only the first three types of NAT devices, but are far more scalable. The ideal solution is to use near-end NAT traversal solutions to every device that supports it (symmetric ...

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