Support Services - How do you purchase additional licenses?

Go to http://www.digium.com/subs

Click Subscription Wizard

It will ask you for your registration code (you only need to enter the first 6 digits).

Select I need to add more subscription users to the Switchvox system. A quantity field will appear where you can enter the number of extensions you want to add and when you click submit then you will be prompted to purchase an additional license.