IMS Network Element - BCF (IBCF+ALG+THIG+TrGW) Overview (Study Note)
IBCF acts as an entry point for this network (instead of the I‑CSCF), and also acts as an exit point for this network.
- IBCF may perform transit routing functions
- IBCF can detect whether an IWF needs to be added in the SIP signalling path
- IBCF can filter all SIP signalling information based on source / destination and operator policy
- IBCF for Generation of CDRs;
- IMS ALG provides the necessary application function for SIP/SDP protocol stack in order to establish communication between IPv6 and IPv4 SIP applications.
- THIG provides network configuration hiding to restrict the following information from being passed outside of an operator's network
- TrGW is located within the media path and controlled by an IBCF, and provides network address/port translation and IPv4/IPv6 protocol translation, and supports proactive and reactive transcoding
BCF (border control function) may be applied between two IM CN subsystem networks or between an IM CN subsystem network and other SIP based multimedia network (R6: ALG à R7: IBCF)
Further Information: https://docs.google.com/fileview?id=F.5bb947aa-ea7f-4e85-b178-9a1d32c0c681&hl=en