# BCF Call Flows

The following illustrations show the function sequence for the two bearer control call flows implemented by vmsamp_ip324m_bicc. The ISUP and BCF sequence (in grey) is used to build and send each Bearer Control Message (in blue). A list of information elements that constitute each Bearer Control Message is also shown.

## Forward Bearer Establishment with Fast Forward Tunneling

The following call flow shows Forward bearer establishment with fast forward tunneling Bearer Control Call Flow:

## Forward Bearer Establishment with Delayed Forward Tunneling

The following call flow shows Forward bearer establishment with delayed forward tunneling Bearer Control Call Flow: