name: OSA
full_form: Open Service Architecture
context: IM-SSF) [56]. : native IMS application server. OSA-SCS an Open Service Access - Service Capability Server interfaces with OSA Application Servers using Parlay. IM-SSF: an IP Multimedia Service Switching Function interfaces with CAMEL Application Servers using CAP. The architecture is based on the principle that the service control for Home subscribed services for a roaming subscriber is in the Home network (e.g. the Serving-CSCF is located in the Home network). There are two possible scenarios to provide services (see figure 5.1.3.3.1.1): via the service platform in the Home Network
description: The Open Service Architecture (OSA) is a standardized framework for secure third-party access to IMS services, enabling the development of value-added IP multimedia services. It provides an interface between application servers and the IMS core network, facilitating service control and interaction with various network functions.
explanation: OSA is classified as Technology because it is a technical framework designed to enable secure interactions between software applications and the IMS core network for delivering multimedia services.
section_title: via an external service platform. The external service platform entity could be located in either the visited network or in the 3rd party platform. The standardized way for secure 3rd party access to IMS services is via the OSA framework as described in [56]. Figure 5.1.3.3.1.1: Locations of service platforms An Application Server (AS) offering value added IM services resides either in the user's home5.1.3.3.13GPP/3GPP2
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