name: FA
full_form: Flexible Alerting
context: Figure 5.3.2.1.2.1 shows the Diameter transactions that are required between AS implementing the FA service and OCS, when online charging is applied to a successful FA communication. Figure 5.3.2.1.2.1: Message sequence chart for online charging of FA service UE-B and UE-C are FA group members of the FA group identified by the "Pilot Identity". A communication is requested from UE-A towards the "Pilot Identity". 1. SIP INVITE request incoming for "Pilot Identity". Based on the Initial Filter Criteria (IFC), indicating the request must be forwarded to an AS implementing FA for this "Pilot Identity". 2. As "online charging" is activated for the "Pilot Identity", the AS implementing FA has to initiate parallel SIP INVITE towards each of FA group members. 3. For FA member User B, the AS sends a Reserve Units Request [Initial, service FA, ICID-B] to the OCS for requesting units for the FA supplementary service. 4. The OCS grants units in the Reserve Units Response response for this request.
description: Flexible Alerting (FA) is a telecommunications service that enables group communication among user equipment (UE), allowing multiple UEs to be alerted simultaneously. It involves online charging and requires coordination between the Application Server (AS) implementing FA, the Online Charging System (OCS), and UE members of an FA group.
explanation: The text refers to 'Flexible Alerting (FA) service' and outlines its purpose as a communication tool for user equipment with features like online charging and system coordination, clearly indicating it is a telecommunications service.
section_title: 5.3.2.1.2Flexible Alerting (FA)
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