name: UNI
full_form: User Network Interface
context: This solution can be viewed as a combination of two concepts: a LI "tap" and a UNI based IMS/SIP service state machine. The "tap" is a function which passively sits on interfaces, passively observes all the traffic travelling across the interface and extracts specific traffic based on specific criteria. It then sends a copy of this extracted traffic on for further analysis. In the case of this solution, the extraction will be specific IMS bearers associated with the targeted user's VoLTE bearers. This tap function can either be a standalone network element, or built into network elements performing other functions (such as S-GW). The UNI based IMS/SIP service state machine with minimal state will interpret the extracted UNI signalling traffic to construct its own state machines. Changes in the UNI state machine will be driven by signalling exchanges extracted from the bearers. The mirror state machine transitions associated with LI reportable events will then be reported to the
description: The User Network Interface (UNI) is a communication pathway between network functions, specifically designed for user-related signaling and traffic exchange in IMS/SIP services. It enables the extraction of specific traffic based on criteria and sends it for further analysis.
explanation: The text explicitly refers to UNI as an interface that facilitates communication and traffic exchange between network elements, aligning with the definition of an interface.
section_title: 6.1.1	Description
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