ITU-T Recommendations

This Recommendation defines the Intelligent Network (IN) Distributed Functional Plane (DFP) architecture for IN Capability Set 2 (IN CS-2). It extends the description of the IN DFP for IN Capability Set 1 (IN CS-1) by inclusion of service management functionality, call-unrelated capabilities, call party handling for more than two parties, and mobility aspects for wireless access.This Recommendation provides:- the IN DFP architecture for IN CS-2, encompassing the functional entities related to IN service execution and service management;- static and dynamic models of the functional entities related to IN service execution and service management (including service switching/call control, service control, call-unrelated, specialized resource, and service data functions), to define how IN service control and service management interact with basic call processing and to understand the nature of the functional entity relationships required for IN CS-2;- description of call party handling capabilities beyond two-party call set-up and clearing;- SIB stage 2 descriptions and distributed service logic to identify information flows and functional entity actions for IN CS-2, and the sequencing of the information flows;- detailed information flow descriptions, including information elements and functional descriptions, as the basis for specifying IN protocols;- mobility aspects of the DFP, as the basis for defining requirements and information flows for wireless systems.Within the Q.1220-series Recommendations, this Recommendation describes the DFP in a service and vendor/implementation independent manner, as constrained by the capabilities of the embedded base of evolvable network technology. This provides the flexibility to allocated distributed functionality into multiple physical network configurations, as described in Recommendation Q.1225, and to evolve IN from CS-2 to some future CS-N. It also provides a framework from which IN protocols are specified for IN CS-2, as described in Recommendation Q.1228.