thanks for reading all of it.
i’m not familiar with PS Handover. Is it the same as “PS Reselection” ?
When MS does a PS HO, then the SGSN should synchronize with the MSC/VLR.
How does your SGSN sync’s with the MSC ? Through Gs interface ?
I’m afraid you’ll have to check how it is configured, and perhaps run traces. Check how the cell update/RA update/LA update is sent from SGSN to MSC, and vice versa.