NFAS Group
For Quad T1 lines, you can set the non-facility associated signaling (NFAS) parameters by clicking Boards==>Lines and double-clicking a device using a quad T1 line. NFAS Details
In the NFAS Group field, enter an integer between 1 and 99. The group number is assigned to all T1 lines belonging to the same NFAS group. The T1 interfaces on a single Quad T1 board must belong to the same NFAS group. If only one T1 interface is available on a board, it can belong to an NFAS group by itself.