Interconnecting SS7 signaling networks

The authors discuss signaling system No. 7 (SS7) network interconnection at the network services (message transfer part and signaling connection control part) protocol layers, emphasizing the gateway signal transfer point (STP). Network interconnection is possible on a basis sufficiently open to allow full call- and service-related signaling, while preventing abuses with the appropriate screening. Subjects such as possible network architectures, signaling network routing and management, and OA&M (operations, administration and maintenance) procedures are discussed as related to the applicable SS7 protocol standards. Supporting signaling protocols that are evolving in standards organizations are discussed, as are screening issues that are not defined in the SS7 protocol