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PRI System

What is PRI System?


There is only one line physically terminating on the customer PBX but still a PRI system can receive/send 30 calls simultaneously! A PRI system is end to end digital circuit. A PRI (Primary Rate Interface) system is a form of ISDN (Integrated Services Digital Network) line which is a telecommunication standard that enables traditional phone lines to carry voice, data and video traffic, among others. A PRI system consists of two pairs of copper lines terminating on a modem from a service provider premises to the customer premises. It uses multiplexing/de-multiplexing techniques to carry more than one channel in a single circuit. There are two common forms of PRI lines – E1 (which carry 30 channels in the two pairs of copper lines, common in Europe, India) and T1 (which carry 23/24 channels in the two pairs of copper lines, common in United States). Each channel in a PRI system provides 64 Kbps for data transmission. A PRI system can connect to both Analog/Mixed EPABX systems and also the newer IP PBX systems. A PRI Card / Interface might be required to terminate the PRI circuit on the PBX. A PRI system can also be used to connect two PBX systems thereby providing 30 channels between them for interoperability.


How does PRI System works?


A trunk is a cost-efficient form of Voice Over IP (VoIP) that leverages a network connection to a Private Branch Exchange (PBX), or digital switch. Each trunk can support up to 23 channels and requires an onsite PBX. Trunking offers additional savings through oversubscription, a concept that operates on a notion that your users will not need the phone at the same time.


To get more information or to receive a quote on a PRI System, then click the button below to get started.



Lower Bill Network, LLC

Lower Bill Network has been helping customers Nationwide since 2015.


Our agents have collectively help lower over 10,000 customers communication bills. We have the best agents in the industry and make sure to help every customer find the best deal possible.

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