The OSA API and Other Related Issues

Abstract

This paper gives an introduction to the open service architecture (OSA) in 3GPP. It describes why such an interface was deemed necessary and how APIs were used in the description of that interface. Mobility was the original focus for the interface and the paper describes the functionality that was felt appropriate for 3GPP's Release 1999 specification. The paper goes on to show the architectural concepts behind this third party applications interface and describes the joint work that is being undertaken between ETSI, 3GPP and Parlay to ensure one consistent API across the piece.