As networks become ever more complex, service providers need to deploy an increasing number of network functions to support the correct routing of traffic through them. Origin and destination-based routing is no longer enough to meet the demand.
Today, operators must often engage in detailed transformations of signaling addresses, meet demanding call barring criteria and, even insert and delete SIP headers and/or their parameters. All of this must be done while performing context sensitive traffic admission control to protect vulnerable network elements from unintended overload.
Meeting these combined demands can result in an unwieldy array of network elements, each devoted to a subset of the required functionality. Operators need to gather their SIP processing needs into a centralized node, simplifying their network topology and reducing both CAPEX and OPEX.