Question: What triggers the GMM eCall inactivity procedure for an eCall only mobile station capable of eCall over IMS and attached for GPRS services?
Option 1: The mobile station is in PMM-CONNECTED mode (Iu mode) or packet transfer mode.
Option 2: The mobile station is in MM IDLE state, and one of the timers T3242 or T3243 expires or has already expired.
Option 3: The mobile station is in any GMM-REGISTERED substate except GMM-REGISTERED.NO-CELL-AVAILABLE or GMM-REGISTERED.PLMN-SEARCH, and both timers T3242 and T3243 expire or have already expired.
Option 4: The mobile station is in PMM-IDLE mode (Iu mode) or packet idle mode, but the network operates in network operation mode III.
Explanation: According to the GMM eCall inactivity procedure, the mobile station must be in any GMM-REGISTERED substate except GMM-REGISTERED.NO-CELL-AVAILABLE or GMM-REGISTERED.PLMN-SEARCH, and both timers T3242 and T3243 expire or have already expired. This condition triggers the GMM eCall inactivity procedure for an eCall only mobile station capable of eCall over IMS and attached for GPRS services.