name: CRS
full_form: Customized Ringing Signal
context: Although CRS Supplementary services may be delivered according to different models (download and play model, DTMF...) as described in TS 24.183 [219], only one scenario is depicted here, and serves as a basis for CRS charging description, as the same principle applies. Figure 5.2.2.1.19.1 shows the Diameter transactions that are required between AS implementing the CRS service and CDF for a successful communication establishment with CRS delivery. Figure 5.2.2.1.19.1: Message sequence chart for offline charging of "CRS" service delivery A communication is requested towards User B, user B has subscribed to CRS 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 CRS supplementary service, the communication is forwarded to an AS implementing CRS. The INVITE is forwarded towards User B. 2. SIP 180 ringing is sent back from User B. 3 to 4. Upon acknowledgment from User A (SIP PRACK), the AS
description: Customized Ringing Signal (CRS) is a supplementary service that allows users to customize the ringing signal heard by the calling party. It involves the delivery of customized ringing signals based on user preferences, which may be implemented through different models such as download and play or DTMF.
explanation: The context describes CRS as a service that enables users to customize their ringing signals, indicating its classification as a 'Service' within the telecommunications domain. The mention of 'CRS Supplementary services', 'service delivery', and 'communication establishment with CRS delivery' further supports this categorization.
section_title: 5.2.2.1.19Customized Ringing Signal (CRS)
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