This counts packets dropped because of a software decision to filter them. Being a deliberate software filtering decision rather than an error condition, a rising count here reflects the modem's access-control or policy logic actively working as intended, such as blocking traffic per some configured rule, rather than indicating a fault, though an admin seeing an unexpectedly high count should confirm the filtering policy itself is correctly scoped and not overly broad. An admin who recently tightened the cdmipAccessListEnforcement policy might see this counter start climbing as a result, confirming the filtering is actively blocking unauthorized traffic as intended.