Primary Rate Interface (PRI) is telecommunications interface

A Primary Rate Interface (PRI) is a telecommunications interface standard used for carrying multiple voice and data transmissions between a network and a user. It is a type of Integrated Services Digital Network (ISDN) connection commonly used in businesses and larger organizations.

Key features of a PRI include:

Channels: PRI consists of multiple channels, typically 23 B channels (bearer channels) and 1 D channel (data channel) in North America, while in Europe, it's usually 30 B channels and 1 D channel. The B channels are used for voice and data transmission, while the D channel is used for signaling and control purposes.

Digital Transmission: PRI uses digital transmission technology, providing higher quality and reliability compared to analog lines.

Multiplexing: PRI multiplexes multiple voice or data channels over a single physical connection, allowing for efficient use of bandwidth.

Flexibility: PRI supports various telecommunication services, including voice calls, data transfer, video conferencing, and other multimedia applications.

Scalability: PRI lines can be easily expanded by adding additional channels, providing scalability to accommodate growing communication needs.

Direct Inward Dialing (DID): PRI lines support DID, allowing callers to directly dial an extension within an organization without having to go through a central switchboard.

Service Quality: PRI lines often offer better call quality, lower latency, and more reliable connections compared to analog lines.

PRI lines are typically used by businesses and organizations that require a higher volume of simultaneous voice or data connections, such as call centers, large corporations, and government agencies. They offer a cost-effective and efficient solution for handling a significant volume of communication traffic.