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

National ISDN-2 OverviewNational ISDN-2 adheres to the ITU-T Q.931 standard for basic callcontrol. Its main difference is the addition of service messages fornotification of changes in the remote end status. Service messages arealso used to take individual channels and spans into or out of service.Several vendors have how adopted National ISDN-2, and it is nowwidely available in North America. Several vendors have implementedcustom call transfer options and supllemental services on theirequipment.National ISDN-2 ConfigurationTable 12-1 lists the filenames, directories, and descriptions of themodules defining the National ISDN-2 protocol.Table 12-1. National ISDN-2 ModulesFilename Directory Descriptionisdn_ni2.dll intv\dll Layer 3isdnL2.dll intv\dll Layer 2isdn_con.exe intv\sys ISDN Console Programrdisdn.exe intv\sys Logging Reader Programprotisdn.dll intv\dll Protocol Support Moduleisdntkit.libintv\invision\toolkits\isdntkit\ISDN toolkit12-2 ISDN Protocol Administrator’s and Developer’s Guide 60001262, First Edition