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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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The PBX supports three types of SIP trunk groups: SIP AT0, SIP PRA, and SIP IP. A SIP IP trunk group implements voice communication between PBX users and inter-office users.

SIP Overview

SIP is an application-layer signaling protocol that creates, modifies, and releases sessions of one or more parties.

Trunk Overview

A trunk is a logical link between two exchange offices. Inter-office calls must be transmitted by trunks. A trunk is bound to the signaling and media addresses of the local office and signaling address of the remote office so that a channel can be established between local and remote offices.

SIP Trunk Overview

A SIP trunk uses SIP to connect to the remote device through an Ethernet cable.

Unlike a circuit trunk that defines a physical channel, a SIP trunk defines a logical channel and solves authentication and addressing problems between local and remote offices.

Table 14-1 describes transport protocols used by the SIP trunk.

Table 14-1  Transport protocols that can be used by a SIP trunk

Transport Protocol



Connectionless transport-layer protocol that provides event-based, simplified, and unreliable information transmission. When UDP is used to transmit data, each datagram is independent and contains the source and destination. Because UDP is unreliable, data may not reach the destination, and the time data reaches the destination and data integrity cannot be ensured.


Connection-oriented protocol. Before data transmission, both ends must establish a virtual channel.

The PBX at one end of a SIP IP trunk does not need to register with the device at the other end. When you configure a SIP IP trunk for a PBX, the remote end must support the SIP IP trunk, as shown in Figure 14-1.

Figure 14-1  Networking of SIP IP trunk groups

Updated: 2019-05-17

Document ID: EDOC1100034005

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