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The SBC Core acting as IBCF (Interconnect Border Control Function) is positioned at the IMS edge and interconnects the operator to other IMS and fixed networks. See SBC as IBCF figure below.
Figure 1: SBC as IBCF
The SBC becomes involved in the SIP signaling path under the following conditions:
At a high level, the functions performed by the IBCF are as follows:
In IMS networks, the IBCF interfaces with the following other functional elements:
For details of configuring the SBC as IBCF, refer to Configuring SBC as IBCF page.