Abstract
Development of value-added services in traditional telecommunication network has some problems, such as high costs and long period. API which hides the protocol details of the underlying network is used in NGN nowadays to speed up service creation and deployment. This paper describes a key development technology of value-added services—Parlay, analyses the architecture of Parlay/OSA API, and then presents a detailed design of “SMS Filter” service and “Positioning and Calling” service, so as to resolve problems of spam messages and user location respectively. At the end of this paper, the two services are implemented in the Ericsson NRG simulator.
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