This document is part of a suite of signaling and control security standards. Figure 1 illustrates the relationships among these standards. The scope of this document is a Signaling System No.7 (SS7) Network, and SS7 network interconnections. This includes interconnection to other SS7 networks and to multimedia signaling and control networks such as SIP and H.323 networks. Specifically, this document provides security requirements and guidelines for a Signaling System No.7 (SS7) network and its network interconnections.