name: CAT
full_form: Customized Alerting Tone Service
context: Although CAT Supplementary services may be delivered according to different models (CAT forking, CAT early session, CAT Gateway) as described in TS 24.182 [217], only one scenario is depicted here, and serves as a basis for CAT charging description, as the same principle applies. Figure 5.2.2.1.16.1 shows the Diameter transactions that are required between AS implementing the CAT service and CDF for a successful communication establishment with CAT delivery. Figure 5.2.2.1.16.1: Message sequence chart for offline charging of CAT service delivery A communication is requested towards User B, user B has subscribed to CAT service. 1. SIP INVITE request incoming for User B. Based on the Initial Filter Criteria (IFC) rules, indicating that User B is subscribed to the CAT supplementary service, the communication is forwarded to an AS implementing CAT. 2. The AS proceeds to CAT resources reservation and forwards SIP INVITE towards User B.. 3. 180 ringing is sent back from User B. 4. The AS
description: Customized Alerting Tone (CAT) Service is a telecommunications offering that enables users to receive customized alert tones for incoming communications, enhancing their user experience.
explanation: The context explicitly mentions CAT as a 'supplementary service' and describes its functionality in relation to user communication, which aligns with the definition of a telecommunications service.
section_title: 5.2.2.1.16Customized Alerting Tone (CAT)
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