Air Traffic Control Frequency and Information Management Policy
This policy defines and authorizes the use of primary and secondary (multiple) frequencies for air traffic controllers on the VATSIM network whilst using the Audio for VATSIM (AFV) voice technology. In addition, this policy outlines the requirements and allowances for air traffic controllers who choose to maintain an automated terminal information system (ATIS) broadcast and the controller information section within ATC radar clients.
It is available here