4.H.1.A pilot who is assigned a trip(s) or base standby in reserve status shall have the trip guarantee or standby pay credited toward his leveling and/or RLG as follows:
For leveling, trip guarantee or standby pay shall be credited upon assignment.
For RLG, trip guarantee or standby pay shall be credited when that pilot:
actually blocks out on the trip;
shows for the standby;
is bumped from the trip or standby; or
is removed from the reserve assignment for sick leave in accordance with Section 14.B.5.b. (Sick Leave)



The above quote shows leveling upon assignment.