Remote Extension

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 registering an extension to the IPPBX when the IP phone is located outside the office network.

Remote Extension Setup Guide

1. Change Default SIP Service Ports for Security

The WAN IP address of the IPPBX is 192.168.1.100 (behind a router). For security reasons, the default SIP service ports should be changed.

Step 1.1: Log in to the IPPBX Web Portal

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

Step 1.2: Navigate to VoIP Advanced Settings

1. Navigate to Telephony → Preferences → VoIP Advanced

Step 1.3: Modify SIP and RTP Ports

Update the SIP Settings with the following port configuration:

Step 1.4: Configure Port Forwarding on the Router

Log in to your router's web portal and set up port forwarding for the following ports:

Note: Different router brands may have different port forwarding configuration interfaces. Please consult your router's support documentation if you cannot locate the port forwarding option.

2. Configure NAT Options

Step 2.1: Navigate to VoIP Advanced Settings

1. Navigate to Telephony → Preferences → VoIP Advanced

Step 2.2: Configure NAT Parameters

Configure the following NAT parameters:

Important Note: The domain ringtel.sip.zycoo.com is an example provided by Zycoo. Do not use it in your own IPPBX configuration.

3. Enable Remote Extension and NAT Support

Step 3.1: Navigate to IP Extensions

1. Navigate to Telephony → Extensions → IP Extensions

Step 3.2: Configure Extension Settings

Click the Edit button for the target extension (e.g., extension 102) and configure the following:

4. Register Extension on the Remote IP Phone

Ensure that your IP phone is connected to a different internet connection than the IPPBX (i.e., outside the office network).

Register the extension using the following information:

5. Disable SIP ALG on the Router

Important: If you experience no audio (one-way or no-way audio) when making calls between extensions, please check the SIP ALG option on your router. It is recommended to disable SIP ALG on the router.

After completing basic call testing between extensions, you may proceed with security configuration.

6. Advanced Security Configuration

Step 6.1: Navigate to Firewall Settings

1. Navigate to System → Security Center → Firewall

Step 6.2: Add Trusted Local Network

Click the Add button under Common Rules to add your local network IP as a trusted IP segment.

This ensures that connections from your local network are trusted and not blocked by the firewall.

Summary Checklist