What Is PRI?

Information About Technology

Core Definition

A Primary Rate Interface (PRI) is a telecommunications standard that establishes a high-capacity digital connection between a company’s phone system (PBX) and the public telephone network (PSTN). This dedicated line offers greater bandwidth than traditional analog phone lines.

Benefit Definition

PRI delivers advantages for businesses that need reliable voice communication and extra features. It provides multiple simultaneous voice channels (23 or 30), supports high-quality audio and video transmission, enables caller ID and advanced call management, and allows for a scalable communication infrastructure as needs grow.

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Technical Definition

PRI uses either a T1 (North America, Japan) or E1 (Europe, Australia) line carrying 23 or 30 “B” (bearer) channels, respectively, for voice or data, plus a “D” (delta) channel for signaling and call control.  PRI is part of the Integrated Services Digital Network (ISDN) family of telecommunications standards.

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