name: CUG
full_form: Closed User Group
context: Figure 5.2.2.1.17.1.1 shows the Diameter transactions that are required between AS implementing the CUG service and CDF for a successful originating communication from User-A CUG member. Figure 5.2.2.1.17.1.1: Message sequence chart for offline charging of CUG service - originating call User-A is subscribed to CUG service. and initiates a communication towards User B. 1. User-A initiates a communication towards User B sending SIP INVITE request. Based on the Initial Filter Criteria (IFC) rules, indicating that User A is subscribed to the CUG supplementary service, the communication is forwarded to an AS implementing CUG. 2. AS performs checks from the request received regarding User A CUG subscription profile, and determines the CUG-communication is allowed for CUG member User-A towards User-B : AS forwards SIP INVITE towards User-B with CUG information included. NOTE: In case the result from AS checks indicates non-CUG communication behaviour (for CUG communication with outgoing
description: Closed User Group (CUG) is a supplementary service in telecommunications that allows a group of users to communicate with each other while restricting access to the group. It enables operators to offer customized services to specific user groups, enhancing their communication experience.
explanation: The context describes CUG as a feature offered by telecom operators to manage communication within a defined group, controlling who can connect and interact. This aligns with the definition of a telecommunications service.
section_title: 5.2.2.1.17.1Closed User Group (CUG): Originating
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