---
title: "Configuring Your Trunk With 3CX v20"
slug: "configuring-your-trunk-with-3cx-v20"
updated: 2026-04-22T20:27:24Z
published: 2026-04-22T20:27:24Z
canonical: "docs.wiretaptelecom.com/configuring-your-trunk-with-3cx-v20"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://docs.wiretaptelecom.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Configuring Your Trunk With 3CX v20

![image(6)](https://cdn.document360.io/902e9780-a72e-4ea2-92b0-fee80121007e/Images/Documentation/image(6).png)

## **Configuring Your Trunk With 3CX v20**

---

### **About 3CX v20**

3CX v20 is a powerful and flexible software-based PBX solution designed to simplify business communications. With its modern architecture and improved security, v20 introduces a streamlined management interface, enhanced SIP trunk configuration, and better scalability for businesses of all sizes. This version refines call routing, provisioning, and integration with VoIP providers, making it easier to set up and maintain reliable SIP trunk connections.

**Supporting Documentation:**

[3CX Documentation](https://www.3cx.com/docs/)

---

### **Pre-requisites**

- Download and [install](https://www.3cx.com/docs/manual/) 3CX v20
- Configure basic settings for your 3CX instance
- [Create a SIP trunk](/docs/creating-a-sip-trunk) on the Wiretap Portal and assign DID(s) to your trunk.

## **Step 1: Configure Admin —> Advanced Settings**

First, we’ll configure our network settings:

1. Click on the “admin” cog on the bottom left-hand side of the console and select **Advanced**
2. Select the **IP Blacklist** tab and be sure to allow the appropriate Wiretap IPs. These can be found in the [Wiretap portal](https://portal.wiretap.com) under **Manage Trunks** —> **Trunks** —> **Whitelist Management**.
3. Click on the **Network** tab and choose your default internet facing IP address and set the **External IP Configuration** with either a static or dynamic IP address.

## **Step 3: Create a SIP Trunk**

Next, we’ll configure our SIP Trunk.

The best way to configure your sip trunk is to use the Wiretap Telecom 3CX v20 template.

1. Download the template here:

[](https://cdn.document360.io/902e9780-a72e-4ea2-92b0-fee80121007e/Images/Documentation/3CX_Template_Wiretap_Telecom(v2).xml)3CX_Template_Wiretap_Telecom(v2)2.93 KB[](https://cdn.document360.io/902e9780-a72e-4ea2-92b0-fee80121007e/Images/Documentation/3CX_Template_Wiretap_Telecom(v2).xml)
2. In 3CX, select **Advanced —> Templates**
3. Select **Provider Templates**
4. Click **Import Provider.**

Alternatively, you can create a “Generic Sip Trunk” via 3CX and have it connect to Wiretap:

1. Select the “admin” cog on the bottom left-hand side of the console and select **Voice & Chat**.
2. Click **Add Trunk**.
3. A pop-up will appear. Select your **Country** and **Provider**.
  1. For **Provider** choose **Generic SIP Trunk (IP Based)** if you’re using an IP trunk, or **Generic VOIP Provider (Registration)** if you’re using a registration trunk.
4. Give your trunk a name and default route.
  1. Check the box that says **Create an outbound rule for this SIP Trunk**.
5. Under **Account Details**, input your **Main Trunk Number**.
6. If you’re using a registration trunk:
  1. In the **Authentication ID** field, input the User ID created when you created your trunk on the Wiretap portal.
  2. In the **Authentication password** field, input the password generated when you created your trunk.
  3. From the **Type of authentication** dropdown, select **Register/Account based**.
7. If you’re using an IP trunk:
  1. Leave the **Authentication ID** and **Authentication password** fields blank.
  2. From the **Type of authentication** dropdown, select **Do not require - IP based**.
8. Under **Server Details**, in the **Registrar/Server** field, input the SRV record.
  1. For v1 Trunks: srv.global.core-trunk.com
  2. For v2.2 Trunks: srv.globalsbc.core-trunk.com
9. In the **Port** field, input “0” and check the box that says Auto discovery.

![](https://cdn.document360.io/902e9780-a72e-4ea2-92b0-fee80121007e/Images/Documentation/Screenshot 2025-04-01 163314.png)

## **Step 3: Apply Changes**

1. Select **Save**.
2. Add Outbound Rules, Users, Departments and Ring Groups accordingly.