Yes. If you need more capacity on a particular server this is achieved by loading a further licence key onto the server.
Using the Aculab licence activation server, you are able to view your current licences, and provided that your licence account has credit for the particular licence type you need, you will be able to create new licences that can then be loaded onto the same server as the original. The ACT system will add the channel counts from the licences installed to give the total licence count. If your licensing account does not have the required credits, these can be added to your account by sending a purchase order to Aculab.