Anti-tromboning
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Anti-tromboning (Also referred to as Anti-Hairpinning or Media Release) is a feature employed in Voice over IP networks that optimises the use of the access network. For example, in an IP-Centrex[1] service environment, the call may be most effectively transported entirely within the subscribers' private network. A Session Border Controller handling calls as they pass from the Access Network to the Core Network can examine the IP Address of both the caller and called parties and if they reside in the same part of the network the media path can be “released” allowing media to flow directly between the two parties without entering the access network. The benefits of this action are two fold: 1) the Caller is not paying for any bandwidth usage on the carrier network and 2) The carrier's network is less congested.
