Question: When mapping a MAP-ReadyForSM message to a NOR (Network-Initiated Operation Request) command, how is the 'Ready for SM from SGSN' flag within the NOR-Flags AVP set if an `alertReasonIndicator` is present in the ReadyForSMArg?
Option 1: It shall always be set to 0 when an `alertReasonIndicator` is present.
Option 2: It shall be set to 1 if an `alertReasonIndicator` is present within ReadyForSMArg; otherwise, it shall be set to 0.
Option 3: The presence of `alertReasonIndicator` has no impact on this flag; it's determined by other parameters.
Option 4: It shall be set to 1 only if the `alertReasonIndicator` specifies a particular reason related to SGSN.
Explanation: According to the mapping rules, the 'Ready for SM from SGSN' flag within the NOR-Flags AVP is directly influenced by the presence or absence of the `alertReasonIndicator` in the ReadyForSMArg. If an `alertReasonIndicator` is received, this flag is set to 1; otherwise, it's set to 0. This ensures consistent signaling between MAP and Diameter interfaces regarding readiness for Session Management (SM) from the SGSN perspective.