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Interoperation Configuration Guide

AR Router

This document provides cases for connecting AR enterprise routers to devices of other vendors.

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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).


A PRA trunk is a digital circuit trunk and uses an E1 interface on the PBX to connect to the remote device through an E1 trunk line. The PRA trunk can use Digital Subscriber Signaling System No.1 (DSS1) or Q signaling (QSIG), and the PBX can function as the user-side or network-side device. A PRA trunk group implements voice communication between PBX users and inter-office users through the signaling mode, access mode, circuit selection mode, call-out right, and call routes. The PBX can use a PRA trunk group to connect to the PSTN and traditional PBXs to protect investments and implement smooth expansion. Figure 11-1 shows the networking.

Figure 11-1  Networking of a PRA trunk group
Updated: 2019-05-17

Document ID: EDOC1100034005

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