Just to add a note to this good info from Brandon and Dennis;
Max. # of Configurable Agents Supported** = 300 (Maximum Supported on IPCC Express)
Max. # of Active Agents Supported** = 300 (In your case this number is 65 which is the Licensed Seats)
From this good doc;
Cisco IPCC Express Features and Specifications
Hope this helps!
Premium licenses give several features to IPCC, for example text to speech, voice recognition, and various HTTP integrations.
Depending on your server you may be able to have a maximum of 300 seats. A seat is good for a single agent login. For a premium license, it is good for 2 CTI ports.
You need a dual processor 7845 to actually get the full 300 seats, 300 CTI ports functionality.
Of special note: you can have many more than 300 agents. The seat licenses are for simultaneous logins. So in your case only 65 agents can be logged in at one time.