The Primary Rate Interface (PRI) is a telecommunications interface standard used on an Integrated Services Digital Network (ISDN) for carrying multiple DS0 voice and data transmissions between the network and a user. PRI is the standard for providing telecommunication services to enterprises and offices.
List of top PBX systems that supports T1/E1/PRI trunks
Featured PRI PBX Products
While buying an EPABX It is very important to select future upgradebale and expandable systems so that future requirements can be catered without additional costs.