 services provide high-level function in a largely synchronous programming model, are given as Web service-based implementations, and are intended primarily for third-party access. Parlay X defines a set of easy-to-use Web services, which provide simple and high-level access to widely used telecommunication functions. In general, both are used together in deployments. More detailed information to the Parlay and Parlay X specifications can be found under [2-4]. Enabling Service Delivery in Next-Generation Networks In recent times, the API standardization in the Telecom world experienced an advent of popularity, given the need for new services and the converging of Telecom and IT world. OMA picked up the Parlay development from 3GPP, ETSI, and the Parlay Group in 2008. The specifications are about to evolve with new interface technology for Representational State Transfer (REST) bindings in addition to Parlay X Web services, as well as with extension with new functionalities developed for the new Next-Generation Services Interfaces (NGSI) in OMA [4], as well as with respective profiles for the interface sets as triggered by the GSMA ACCESS group for the GSMA One API [5]. 4.2.3 Service Broker, Service Capability Interactions, and Service Orchestration Accelerating the time to market for new services is consistently one of the drivers for the acquisition of new service creation and delivery architectures. In order to bring new services more quickly, the industry realized the need of reuse of compo- nents as part of the new service mix. The ability to support new product assembly from reusable service components has also been one of the rationales to invest in IMS and Service Delivery Platforms (SDP). Both support the concept of reusable components into new products and services in a quick manner, and it is expected to provide this simpler, and in a more cost-efficient way. This expectation is feed as both platforms support the separation of the application from the core network through an abstraction layer in the SDP