IPPBX Multi-Branches Connection via Proxy

Overview

Zycoo IPPBX is built on the Asterisk platform and supports the standard SIP protocol. It can connect to IMS SIP trunks from ITSPs (Internet Telephony Service Providers) as well as SIP endpoints.

This document provides instructions for connecting multiple branch IPPBX systems via a SIP Proxy.

Branches Connection Setup Guide

Prerequisites

Before beginning the configuration, ensure the following conditions are met:

Important Notes:

• The proxy domain zycoopbx.sip.zycoo.com is an example provided by Zycoo. You should use your own proxy domain in your trunk configuration instead.

• Do not activate the SIP proxy on IPPBX-B.

1. Configuration of IPPBX-A

Extension Range: 400–499

Step 1.1: Create a SIP Trunk (Server Mode)

1. Log in to the IPPBX web interface using the admin account

2. Navigate to Telephony → Outbound Control → Trunks

3. Click the Add button under SIP Trunks to create a new SIP trunk

4. Click Submit after configuration

Configure the SIP trunk with the following parameters:

Step 1.2: Edit the Server Trunk

1. Click the Edit button for the server trunk you just created

2. Navigate to the Other tab

3. Clear the From User field to ensure correct caller ID for outbound calls via this trunk
   

Note Regarding TLS:
If your region blocks standard UDP SIP, you may use TLS as the Transport Protocol. If switching to TLS, update the Out Proxy Port to 5162.

Step 1.3: Configure Dial Rules

1. Navigate to Telephony → Outbound Control → Dial Rules

2. Click the Add button for DialOut to create a new rule

Configure the dial rule as follows:

Step 1.4: Configure Dial Permission

1. Navigate to Telephony → Outbound Control → Dial Permission

2. Ensure that DialPlan1 includes DialOut

Step 1.5: Update VoIP Advanced Settings (Important for Server Mode)

Because IPPBX-A operates in Server Mode, please update the following setting:

1. Navigate to Telephony → Preferences → VoIP Advanced

2. Set Endpoint Identifier Order to: ip,username,auth_username,anonymous

2. Configuration of IPPBX-B

Extension Range: 500–599

Step 2.1: Create a SIP Trunk (Client Mode)

1. Log in to the IPPBX web interface using the admin account

2. Navigate to Telephony → Outbound Control → Trunks

3. Click the Add button under SIP Trunks to create a new SIP trunk

4. Click Submit after configuration

Configure the SIP trunk with the following parameters:

Step 2.2: Edit the Server Trunk

1. Click the Edit button for the server trunk you just created

2. Navigate to the Other tab

3. Clear the From User field to ensure correct caller ID for outbound calls via this trunk
   

Note Regarding TLS:
If your region blocks standard UDP SIP, you may use TLS as the Transport Protocol. If switching to TLS, update the Out Proxy Port to 5162.

Step 2.3: Configure Dial Rules

1. Navigate to Telephony → Outbound Control → Dial Rules

2. Click the Add button for DialOut to create a new rule

Configure the dial rule as follows:

Step 2.4: Configure Dial Permission

1. Navigate to Telephony → Outbound Control → Dial Permission

2. Ensure that DialPlan1 includes DialOut
   

3. Verification

After completing the configuration on both IPPBX systems:

• Extensions on IPPBX-A (400–499) can call extensions on IPPBX-B (500–599)

• Extensions on IPPBX-B (500–599) can call extensions on IPPBX-A (400–499)