Creating virtual-switch architecture is the main goal for deploying an SS7 gateway. SS7 gateways are designed in a way to meet objectives for reusability, expandability, and interoperability. The optimal solution would employ Enterprise Computer Telephony Forum (ECTF) architecture framework recommendations as the base for the internal architecture of an SS7 gateway.

SS7 gateway development integrates ECTF standards wherever these standards are applicable and are ratified—i.e., S.100. In the areas that ECTF has not recommended a standard—i.e., the interface between the gateway and NASs—a generic approach based on the most relevant and accepted standards, such as Q.931, is followed.

Because the SS7 gateway is part of the telephony network, the platform must adhere to all requirements and standards that govern the operation of a system at telco switch sites. One such platform, the Stratus Continuum 400–CO, is well suited for this application. The 400–CO is a custom rack-mounted system based on the Continuum Series 400 systems and has been available for over a year. The enclosure meets applicable new equipment building system (NEBS) and European Telecommunications Standards Institute (ETSI) criteria for CO computing elements. The fault-tolerant pair and spare processing architecture provides the continuous availability that is a requirement in such environments.