After dialing the FAC, the user has the option to dial a Route Code. The Route Code is a 2-digit DSN code that consists of a Route Code Setup digit and the Route Code digit. The Route Code informs the communication server of special routing or termination requirements. The Route Code is limited to the DSN. The Route Code determines whether a call uses data-grade or voice-grade trunking. The Route Code also indicates whether the dialed number is a Federal Telephone System (FTS) or a Continental US (CONUS) commercial number.

If you do not require special call features, and you want to use the default value 0, you do not have to use the Route Code. If you want to use a value other than the default value 0, you must use the Route Code.

The Route Code digit becomes part of the dialed number, and can be used for route selection by the Precedence Routing translations. With Precedence Routing, digit strings to be modified before outpulsing. This capability modifies the Route Code as needed by the terminating trunk group. If a Route Code digit is not dialed, the system inserts the default Route Code Digit of 0 as defined on the Multiple Level Precedence & Preemption Parameters screen. The default Route Digit routes the calls over the voice network, not the data network.