Station security codes (SSC) provide security to station users by preventing other users from accessing functions associated with a station. Security codes are used with remote activation of Extension to Cellular. With Remote activation, off-premises users can dial in to Communication Manager using a special DID number, that maps to a Remote Access Extension number. Users can then enter the security code, and can use any feature that can be accessed through Feature Access Codes. SAFE requires SSCs. Conditional Call Extending also requires SSC.