Eicon Networks Diva V8.3 Reference Manual page 20

5. The 'ISDN Multisubscriber Numbers' box is displayed:
You may enter the MSNs or the extension range that you want to assign to RAS here.
It is recommended to assign the MSNs or extension range later on in the Diva Server
Configuration Manager because it provides a complete overview of the number
configuration.
Click 'Next'.
Note: If you configure and assign no ISDN numbers at all, neither in the ISDN wizard
nor later on in the Diva Server Configuration Manager, RAS accepts all incoming calls.
Software Installation 20