The Acti encoders works great in ExacqVision.
You will need one license per channel. When you add the device in EV, you need to add the same device multiple times (one time per channel). Each channel responds to a separate http port. Channel 1 = port 800, Channel 2 = 801 and so on. If you try to connect to a multi port Acti encoder on port 80 (as you would do with a single channel Acti encoder) it will not work.
//Emil