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When networks using different levels of trust are interconnected, the prevailing security model is to create a gate through which all inter-network communications must pass; that is, a single point (or very limited number of points) at which security policies are enforced. In most scenarios, the greatest concern is generally when an external untrusted network communicates with a trusted network. The Ribbon SBC is positioned at the network border to guard the internal network (core network) from security threats.