scope:

GENERAL

SS7 Network Gateway Screening

SS7 messages will only be allowed to pass from one network to another, between network elements which have been identified by both networks as a supporting element of a jointly provided service or application. A network element will be specified by OPC, DPC, C'gPA, C'dPA.

Other message fields applicable to screening include, but are not limited to, SI, PRI, H0-H1, message type, internetwork translation types, APC, ASSN, and DF. Where applicable, appropriate values are specified/assigned in national standards.

Network Gateway Screening tables are configured based on the requirements and security concerns of the screening network. At the time of network interconnection, both networks should share screening information, to ensure no network incompatibility has been introduced by the interaction of the screening functions

After interconnection is established, screening changes which affect the terms and conditions of the interconnection agreement, require prior notification to the affected interconnected network provider.