ISDN Protocol Administrator's and Developer's Guide ... - Intervoice

AT&T Custom ISDN ConfigurationOptional Entries[ISDN_NO_NSF_ELEMENT]Prevents the Facility information element from being sent with theOutbound Setup message.Because the Facility information element is network-specific, andcan cause unpredictable conflicts with some networks, thosenetworks will often reject a message with this element attached.There are no parameters associated with this entry. A properlyconfigured entry is shown below:[ISDN_NO_NSF_ELEMENT]Optional ServicesNon-FacilityAssociated Signaling(NFAS)Non-Facility Associated Signaling allows a single D channel to controlmultiple PRI interfaces (including the one containing the D Channel).In Facility-Associated Signaling, the D Channel can only assign calls tochannels on the interface that contains the D Channel.For detailed informationabout NFAS, see AT&TTechnical Reference (TR)41459.D Channel Backup is not supported in this implementation of NFAS.Required FilesThe only additional file required for Non-Facility Associated Signaling(NFAS) is nfas_att.dll. It should be stored in intv\dll.60001262, First Edition AT&T Custom ISDN 8-5