What is meant by K9 and seats in cisco call manager 6.0 Eg:MCS7845H2-K9-CMB1 Unified CM 6.0 7845-H2 Appliance, 0 Seats
0 Seats menas that this unit is not licensed for any user. You need to purchase a node license for it [apart from the DLUs].
The part number is
LIC-CM6.0-7845= License Unified CM 6.0 7845 Appliance, 5,000 seat
Once you purchase this you can have upto 500 users on thsi server. If you want to have total 7500 users [max] you need to order following partnumber in addition to the above mentioned -
LIC-CM6.X-2500= License Unified CM Additional 2500 Users