name: BBIFF
full_form: Bearer Binding Intercept and Forwarding Function
context: bearer is created (see also the step 5), for the inbound roaming UEs with home-routed roaming (i.e. for S8HR APN). The BBIFF present in the SGW notifies the LMISF-IRI about the IMS signalling bearer information over the LI_X2_LITE reference point. The notifications include the IMSI, bearer information (e.g. bearer ID) and the UE location information. The LMISF stores the bearer information and the UE location information. Based on the QCI value of 5, the BBIFF present in the SGW determines that the bearer is created for IMS signalling. The BBIFF present in the SGW captures and delivers the UP packets from the IMS signalling bearer to the LMISF-IRI over the LI_X3_LITE_S reference point. The LMISF-IRI examines the received UP packets and examines the SIP message included within those packets for any target match. When there is no target match, the LMISF-IRI extracts and stores the SIP message. The BBIFF present in the SGW detects that IMS media bearer is created for inbound roaming UE
description: The Bearer Binding Intercept and Forwarding Function (BBIFF) is a network function responsible for intercepting and forwarding bearer information, including IMS signalling bearer data. It plays a crucial role in the lawful interception of IMS signalling traffic by capturing and delivering UP packets to the Lawful Interception Management System Function - Internal Router Interface (LMISF-IRI).
explanation: BBIFF is classified as a Network Function because it performs a specific task within a telecommunications network: intercepting and forwarding bearer information. This function interacts with other network elements like SGW and LMISF-IRI, demonstrating its role in network operations.
section_title: 4.8.4.3.1	Initial configuration - applicable to all inbound roamers
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