When CSFB start, the UE registers to the SGSN which initiates MAP-ULGPRS to the HLR.
At this point, does the HSS sends CANCEL-LOCATION (CLR Diameter s6a) to the MME?
In the same context, when the UE returns to LTE, does the MME set the "Skip Subscriber Data" flag (part of the ULR flags to indicate that the HHS may skip the subscription data in the ULA?
