Does VitalPBX require a License for the number of Extensions, IVRs, Queues, Trunks, and other features? 

For features we have deemed essential, you do not require a license. So, with the Community Version of VitalPBX, you get unlimited extension, IVRs, Queue, Trunks, Announcements, agents, and more. Licenses are only required for our commercial add-ons. 

https://vitalpbx.com/vitalpbx-store/