global functional plane (IN) (GFP)
The Global Functional Plane (GFP) is a functional layer in the IN layer model.
The Global Functional Plane (GFP) lies between the Distributed Functional Plane ( DFP) and the Service Plane( SP). The GFP layer has a global approach and abstracts intelligent networks (IN) into a single instance on which all services are realized with Service Independent Building Blocks( SIB).
The Global Functional Plane is specified in ITU Recommendation Q.1201 "Principles of Intelligent Network Architecture".