# Using NFAS with isdndemo

You can use isdndemo to demonstrate placing and receiving calls on trunks in non-facility associated signaling (NFAS) mode. To do this, use the following option to specify the NFAS group number:

-g group_number

Use this option in place of the -a option, which specifies the NAI number and is used only with non-NFAS configurations.

isdndemo reads the NFAS configuration for a given group from the OAM database. The group number given must correspond to the board where the D channel for the NFAS group is located.