Information About the NAT Optimized SIP Media Path Without SDP Feature
Benefits of NAT Optimized SIP Media Path Without SDP
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The media path can be shortened, decreasing voice delay.
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More control of voice policy is possible because the media path is closer to the customer domain and not deep within the service provider cloud.
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Processes all packets sent through the NAT-enabled router, even those without the Session Description Protocol (SDP).
NAT Optimized SIP Media Path Without SDP Feature Design
Cisco IOS NAT will add the relevant translation information per SIP session within the SIP protocol messages. The SIP Application Layer Gateway support within Cisco IOS NAT will extract this translation information from the SIP packets and create NAT table entries.
The “piggybacking” of NAT translation information within the SIP call flows, the design of how users interact with the application when they talk to it, will allow the media path of a SIP VoIP session between two calling parties to take the optimized routing path between each other.