Users have to have a minimum rating to control some airports within Iranian airspace. Here are the minimum required ratings:
General Guidelines for Controllers
General The purpose of this document is to ensure that quality service is provided at all times in Iranian airspace, and also so that a Controller will never find himself submerged, and unable to cope. It is mandatory for all IVAO members controlling an Iranian position to follow these guidelines. Users who do not comply may be asked to close their position. The Guidelines