# Developing an NMS ISDN application

Perform the following steps to create an NMS ISDN application:

Step | Action | Refer to...
--- | --- | ---
1 | Install digital trunk interface boards in a system, and any other boards you will need in your application. | The board installation manuals
2 | Install Natural Access. | Installing Natural Access
3 | Install the NMS ISDN software for each country or region where your application will be used. | NMS ISDN Installation Manual
4 | Edit the system configuration file and the board keyword files so they describe all boards in the system. | The NMS ISDN Installation Manual, the installation manuals for your boards, and the NMS OAM System User's Manual
5 | Test the hardware installation. | The board installation manuals
6 | Write the application. | This manual and the Natural Access documentation set