NFAS Details
Non-facility associated signaling (NFAS) is an ISDN PRI protocol that allows you to define one or two D channels to carry signaling messages for up to 20 ISDN Primary Rate Interfaces (PRIs). This feature relieves telephone companies and Internet service providers (ISPs) of the need to provide D channel signaling for each PRI, and increases bandwidth by making those D channels available to carry data.