ACC-DIALMGMT::accDl2SysT9 sets the T9 timer in seconds (60–240) for DL2, typically used to guard against calls stuck in active state or to enforce maximum call duration. Engineers adjust this parameter when they need to prevent hung-up calls from consuming signaling resources indefinitely or when they want to implement billing-based maximum call lengths. For instance, setting this to 120 seconds might limit how long a single DL2 call can remain in an unsupervised state before automatic cleanup.