cTap2MediationContentId is a session identifier, from the
intercept application's perspective, and a content identifier
from the Mediation Device's perspective. The Mediation Device
is responsible for making sure these are unique, although the
SNMP RowStatus row creation process will help by not allowing
it to create conflicting entries. Before creating a new entry,
a value for this variable may be obtained by reading
cTap2MediationNewIndex to reduce the probability of a value
collision.