2. Basic handover procedure not requiring the establishment of a circuit connection between MSC-A and MSC-B
3. Subsequent Handover from MSC-B back to MSC-A
4. Subsequent Handover from MSC-B to MSC-B’
5. Subsequent Handover from MSC-B back to MSC-A without circuit connections
6. Subsequent Handover from MSC-B to MSC-B’ without circuit connections
7. Circuit-switched call establishment after a Basic GSM to GSM Handover without circuit connection
