Solving the Firewall/NAT Traversal Issue of SIP: Who Should Control Your Security Infrastructure?

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By Ingate Systems

This is a great paper that dives into the firewall/NAT traversal issue. The paper provides solid alternatives and solutions to the problem so that Session Initiation Protocol (SIP) sessions can be supported throughout an enterprise. For background on the firewall/NAT traversal issue: SIP-based communication does not reach users on a LAN behind firewalls and Network Address Translation (NAT) routers automatically. Firewalls are designed to prevent inbound unknown communications and NAT stops users on a LAN from being addressed. Firewalls are almost always combined with NAT and typically do not support SIP properly.

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