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.
PRI line can receive/send 30 calls simultaneously
Each channel in a PRI line provides 64 Kbps for data transmission
PRI lines are end-to-end digital lines and hence the clarity is much better than analog trunk lines.
Everything in PRI connection – all the equipment, cables, protocols – everything is digital.
PRI calls are not exposed to internet security risks since data is transmitted over physical infrastructure.
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.