Question: In a PS-PS Access Transfer with partial media transfer for an active multimedia session between UE-1 and UE-2, what does UE-1 update after sending an INVITE for partial transfer?
Option 1: Only the signalling address on the new IP-CAN
Option 2: The entire session to release the old IP-CAN connection
Option 3: Session information over the old access leg, keeping it active
Option 4: Media addresses without updating the signalling path
Explanation: In a partial media transfer scenario during PS-PS Access Transfer, UE-1 splits the multimedia session between two IP-CANs. After initiating the transfer, instead of fully releasing the old session, UE-1 updates the session details on the original access leg to maintain continuity for the part of the session remaining on that leg, ensuring seamless service continuity across both parts of the split session.