SIP Firewall and NAT Traversal

TUTORIALS

 What is NAT (Network Address Translation?)  Why do we need ALG (Application Layer Gateway?) 
964kb Zipped Powerpoint tutorial  

By SIPKnowledge SIP Center Associate Sponsor

A very well written and descriptive tutorial on NAT and the traversal problems for SIP Networks.

View the powerpoint tutorial here >>>

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WHITEPAPERS

  (www.ingate.com) Solving the Firewall/NAT Traversal Issue of SIP: Who Should Control Your Security  Infrastructure?

 AG Projects - SIP Center Principal SponsorBest practices for SIP NAT traversal

    Paradial Whitepaper - Connectivity Challenges for Real-time IP Communications - How NATs and firewall issues are solved efficiently and securely

 Media Proxy - NAT traversal for geographically distributed Voice over IP networks

 NAT Traversal in SIP


LINKS AND RESOURCES

IETF RFC 3489 - STUN - Simple Traversal of User Datagram Protocol (UDP) Through Network Address Translators (NATs)

Using Asterisk as a SIP/IAX Gateway - The Asterisk open source telephony server can be used as a gateway in order to avoid SIP NAT Traversal.

SIPfoundry - The NAT & Firewall Traversal Problem

SIP Foundry - SIP NAT Traversal using the Astaro Security Linux Firewall

SIP Foundry - Introduction to STUN Servers

Sourceforge Project: STUN Client and Server library - This project implements a simple STUN (Simple Traversal of UDP through NATs) server and client on Windows, Linux, and Solaris.