This Recommendation defines the Intelligent Network (IN) Distributed Functional Plane (DFP) architecture for IN capability set 1 (IN CS-1). It does define the IN DFP for IN CS-1 based on the general framework for IN DFP studies provided in Recommendation Q.1204, consistent with the scope of IN CS-1 defined in Recommendation Q.1211.
This Recommendation provides:
– the IN DFP architecture for IN CS-1, in terms of a subset of the general IN DFP architecture encompassing only the functional entities related to IN service execution;
– static and dynamic models of the functional entities related to IN service execution (including service switching/call control, service control, specialized resource, and service data functions), to define how IN service control interacts with basic call processing and to understand the nature of the functional entity relationships required for IN CS-1;
– SIB stage 2 descriptions to identify information flows and functional entity actions for IN CS‑1;
– detailed information flow descriptions, including information elements and functional descriptions, as the basis for specifying IN protocols;
– a starting point for the study of call party handling capabilities beyond two-party call set-up and clearing.
This Recommendation forms a useful basis for gaining implementation experience with the IN DFP. As with any project of this size and complexity, it can be anticipated that there may be difficulties in interworking the various implementations of physical elements based on IN CS-1 DFP functionality. To achieve the IN objective of a multi-vendor environment, this Recommendation may go through some future revision in the light of implementation experience.
Within the Q.1210-series Recommendations, this Recommendation describes the distribution of global functional plane functionality defined in Recommendation Q.1213 (i.e. service independent building blocks [SIBs] for IN CS-1) 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.1215, and to evolve IN from CS-1 to some future CS-N. It also provides a framework from which IN protocols are specified for IN CS-1, as described in Recommendation Q.1218.