PRI
Primary Rate Interface (PRI) is the telecommunications standard user interface for an ISDN (Integrated Services Digital Network) that allows for simultaneous delivery of voice, data and video over specific channels on standard lines. A PRI can have significant cost savings compared to a traditional PBX telephone. ISDN PRI connects and processes phone calls faster and consolidates many analog lines into one or a few digital lines. It provides exceptional voice quality and reliability with an additional feature, Caller ID, which is not found on a T1 line.