3.1.2.12 SendBaseSymmetricKeyCache Cleanup Timer

This timer regulates the amount of time that the protocol waits before removing expired entries from the SendBaseSymmetricKeyCache ADM element. This timer is set either when a CachedSymmetricKey (section 3.1.1.3.3) ADM element instance is added to the SendBaseSymmetricKeyCache ADM element, as specified in section 3.1.7.1.5, or when the SendBaseSymmetricKeyCache Cleanup Timer Event (section 3.1.6.12) is processed.