When purchasing UCM 6.0 with 500 seats(LIC-CM6.0-7816=), what does it mean ? does it mean that we can run this UCM 6.0 with 500 IP Phones, in this case no need to purchase DLU ? or do i always need to purchase DLU equal to the number of IP Phones and their relevant unit (based on DLU calculator)...
You are most correct, the DLU's based on the per unit weight still need to be purchased :) The Seat License is related to the number of Users (500 in your example).
Hope this helps!