22.1273GPPRelease 9Service requirement for the Open Services Access (OSA)Stage 1TS
In order to be able to implement future applications/end user services that are not yet known today, a highly flexible Framework for Services is required. The Open Service Access (OSA) enables applications implementing the services to make use of network functionality. Network functionality offered to applications is defined in terms of a set of Service Capability Features (SCFs). These SCFs provide functionality of network capabilities which is accessible to applications through the standardised OSA interface upon which service developers can rely when designing new services (or enhancements/variants of already existing ones).
The aim of OSA is to provide a standardised, extensible and scalable interface that allows for inclusion of new functionality in the network with a minimum impact on the applications using the OSA interface.