To perform IP Bearer control, BICC messages (Call Control or APM) are used to tunnel the IP bearer-related information, such as Bearer Characteristics, Codec, and IPBCP. IPBCP (IP Bearer Control Protocol) is a protocol based on SDP, and is used to exchange Bearer IP Addresses, RTP port numbers, and Packetization Time.
These two call flows are commonly used call flows in a 3GPP BICC IP Core Network.
Note: Some of the call flows use Dialogic platform. Please refer to Dialogic for more details about the implementation.
Call Flow: Forward Bearer Establishment with Fast Forward Tunneling
The following illustration shows forward bearer establishment with fast forward tunneling Call Flow:

Call Flow: Forward Bearer Establishment with Delayed Forward Tunneling
The following illustration shows forward bearer establishment with delayed forward tunneling Call Flow:

3G-324M over IP Components
The following illustration shows the 3G-324M over IP components from a stack perspective and highlights the BCF library: (Using DIALOGIC's NaturalAccess Platform)

Content courtesy: Dialogic
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