In Release 2 or later, any port on the MERLIN Messaging System can be used to access the Remote Maintenance Device (RMD) (also referred to as a modem) by entering after the MERLIN Messaging System has answered a call. In Release 1.1, and in Release 2 or later in which the licensed port configuration is 10 ports or less, the RMD can also be accessed by connection to Port 12 on the MERLIN Messaging System.