# Developing an ISDN Software application

Complete the following steps to create an ISDN Software application:

Step | Action | Where step is documented
--- | --- | ---
1 | Install digital trunk interface boards in a system and any other boards you will need for the application. | The installation manuals for the boards.
2 | Install NaturalAccess. | The NaturalAccess installation booklet.
3 | Install the ISDN Software for each target country where the application will be used. | The Dialogic® NaturalAccess™ ISDN Software Installation Manual.
4 | Edit the board keyword file so it describes all boards in the system. | The Dialogic® NaturalAccess™ ISDN Software Installation Manual, the installation manuals for the boards, and the Dialogic® NaturalAccess™ OAM System Developer’s Manual.
5 | Test your hardware installation. | The installation manuals for the boards.
6 | Write the application. | This manual, the Dialogic® NaturalAccess™ ISDN Messaging API Developer's Manual, and the NaturalAccess documentation set.