Difference between "PerMax" & "High"

Hi everybody,

i have a question regarding the CLI command "show sessions" in the E-SBC 6.4.0. When you look at the Console Output under the "Livetime" column, there are two "subcolumns", which are "PerMax" and "High". As i understand from the documentation "PerMax" is the peak anmount of session which are simultaniusly open in the whole Livetime of the SBC. But i dont get any information about the Column "High". Can anybody explain it to me?

Example Output:

demuc-srvsbc1# show sessions

15:34:33-183 Capacity=150

Session Statistics            -- Period -- -------- Lifetime --------

                    Active    High   Total      Total  PerMax    High

Total Sessions          60      64      62     2996     145      83

SIP Sessions            60      64      62     2296     145      83