About ISDN PRI.
What is ISDN?
ISDN stands for Integrated service digital network.There are two types of ISDN.
ISDN PRI:ISDN PRI(Primery rate interface) used for big organisation,while
ISDN BRI:ISDN BRI (Basic Rate Interface) used by small and medium enterprises.
This BRI includes two 64kbit/s B chennal and one 16kbit/s D chennal.