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What is PRI and what is it's function in our country

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DEFINITION

Primary Rate Interface (PRI)

Posted by: Margaret Rouse

 

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This definition is part of our Essential Guide: The basics of SIP trunking explained

In the Integrated Services Digital Network (ISDN), there are two levels of service: the Basic Rate Interface (BRI), intended for the home and small enterprise, and the Primary Rate Interface (PRI), for larger users. Both rates include a number of B-channels and a D-channel. Each B-channel carries data, voice, and other services. The D-channelcarries control and signaling information.