@athanzzz
For users:
- You need a Phone System add-on license for every single user (500), assuming every user needs to be able to dial a PSTN number or EXT on your PBX.
For IP Phones such as hallway phones or lobby phones:
- You need a Common Area Phone license for every single device.
For IP Phones or Meeting Room systems:
- You need a Meeting Room license for every single device.
For your SBC:
- You only need concurrent call licenses, meaning you only need to license what you believe the peak number of calls would be.
User & device licensing is much different than the SBC licensing. You must license every single user that may require the capability to make a call through Direct Routing. SBCs, however, are not typically licensed in a 1:1 ratio (concurrent call:user) and are more commonly allocated in a 1:3 or 1:4 ratio, depending upon Erlang calculations.
