name: SDF
full_form: Service Data Flow
context: signalling traffic or the IMS signalling bearer being used for non-standard traffic. As this may be considered a billing problem in the VPLMN, there may already be PCRF rules to prevent this kind of traffic. Thus, it is a configuration option in the VPLMN whether the LMISF informs the LPCF, which then acts according to VPLMN policy, which is enforced by S-GW/BBIFF. Possible VPLMN policies may be termination of offending SDF or reporting of the policy violation to authorities or OAM. LMISF is also aware of SIP IEs used for setting up media plane security, i.e. a crypto information element in the SDP offer, cf. TS33.328 [8]. If the LMISF detects such IEs proposing confidentiality protection be established, LMISF informs LPCF, which then acts according to VPLMN policy, which is enforced by S-GW/BBIFF. Possible VPLMN policies may be termination of offending SDF or reporting of the policy violation to authorities or OAM.
description: A Service Data Flow (SDF) refers to a specific flow of data traffic within a telecommunications network, particularly in the context of service-based architecture. It represents a connection or communication link between network endpoints for data transmission.
explanation: The text describes SDF as a "connection or communication link" used for data transmission, aligning with the definition of a connection in telecommunications.
section_title: 6.1.5.10	Approach to key Issue # 10 - Prevention of unwanted use of confidentiality mechanisms
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