Primary Rate Interface

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Primary Rate Interface - (PRI) A type of ISDN connection. In North America and Japan, this consists of 24 channels, usually divided into 23 B channels and 1 D channel, and runs over the same physical interface as T1. Elsewhere the PRI has 31 user channels, usually divided into 30 B channels and 1 D channel and is based on the E1 interface.

PRI is typically used for connections such as one between a PBX (private branch exchange, a telephone exchange operated by the customer of a telephone company) and a CO (central office, of the telephone company) or IXC (inter exchange carrier, a long distance telephone company).

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integrated services digital network
ISDN

pri

The demonstration shows how service providers can connect IP-based customer interaction and contact center applications with existing Public Switched Telephone Network (PSTN) interfaces, using Primary Rate Interface and SS7 ISDN User Part (ISUP).

Veraz Networks Showcases NGN Network and Subscriber Services ... by Business Wire

The carrier-grade solution delivers key applications such as full-feature interexchange carrier (IXC) tandem, Class 4/5, primary rate interface (PRI) offload, packet/cell switching, and voice over broadband (VoB) services all on a distributed platform.

Thacker-Grigsby Selects Tekelec's Class 4 Switch for Next-Generation ... by Business Wire

ICG will continue to offer PRI, primary rate interface service to ISPs, other carriers and businesses, as well as retain its nationwide data backbone.

ICG Announces Sale of Wholesale Dial Access Business to Level 3 by Business Wire

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