Question: What happens when a Mobile Station (MS) receives an ACTIVATE MBMS CONTEXT REJECT message from the network with a cause code indicating "insufficient resources"?
Option 1: The MS will immediately attempt to activate the MBMS context again.
Option 2: The MS will stop timer T3380 and enter/remain in state PDP-INACTIVE, but may include a Back-off timer value IE in the next ACTIVATE MBMS CONTEXT REQUEST message.
Option 3: The MS will stop timer T3380 and enter/remain in state PDP-INACTIVE, and the network may include a Re-attempt indicator IE to indicate whether the MS is allowed to attempt an MBMS context activation procedure in an equivalent PLMN.
Option 4: The MS will ignore the ACTIVATE MBMS CONTEXT REJECT message and continue with the MBMS context activation procedure.
Explanation: When a Mobile Station (MS) receives an ACTIVATE MBMS CONTEXT REJECT message from the network with a cause code indicating "insufficient resources", it will stop timer T3380 and enter/remain in state PDP-INACTIVE. Additionally, if the Back-off timer value IE is included in the reject message, the network may include a Re-attempt indicator IE to indicate whether the MS is allowed to attempt an MBMS context activation procedure in an equivalent PLMN. This allows the MS to wait for a period of time before attempting to activate the MBMS context again, reducing the load on the network.