---
title: "SIP Trunk Management: How to Connect a Local Provider Phone Number to 3CX"
description: "Ever wondered how an office phone number can be used on a laptop, phone, or IP Phone without plugging in a physical phone line? The answer is **SIP Trunk**. If this is your first time using 3CX, don't worry. This…"
url: "https://solusipbx.id/en/pusat-bantuan/manajemen-sip-trunk-3cx-eng/"
updated: "2026-10-02"
category: SIP TRUNK
---

# SIP Trunk Management: How to Connect a Local Provider Phone Number to 3CX

Ever wondered how an office phone number can be used on a laptop, phone, or IP Phone without plugging in a physical phone line? The answer is **SIP Trunk**.

If this is your first time using 3CX, don't worry. This article will walk you through it in plain, easy-to-follow language.

## What Is a SIP Trunk?

A SIP Trunk is a service that connects a **phone number from a provider** to a digital phone system like **3CX** over the internet.

So your office number stays the same, but it can be used from a variety of devices.

For example, say you have these numbers:

- 021-12345678 (Jakarta)
- 031-87654321 (Surabaya)

Those numbers can be connected to 3CX so your Sales or Customer Service team can make and receive calls directly from the 3CX app.

## Common Local SIP Trunk Providers

Some providers commonly used in Indonesia include:

- Telkom
- Indosat
- XL Axiata
- VOIP Call

Just make sure whichever provider you use supports **SIP Trunk** service.

## Before You Start, Prepare These

Before connecting a SIP Trunk to 3CX, make sure you already have:

- An active 3CX account
- SIP Trunk details from your provider
- SIP username
- SIP password
- SIP server/registrar
- DID number (if any)
- A stable internet connection

Your provider usually gives you all this information once the service is activated.

## How to Connect a SIP Trunk to 3CX

## 1. Log In to the 3CX Admin Console

Sign in to the **Admin Console** using an administrator account.

## 2. Open the SIP Trunks Menu

Go to:

**Admin → SIP Trunks**

Then click **Add SIP Trunk**.

## 3. Select the Country and Provider

Select:

- Country: select worldwide
- Provider: select Generic SIP Trunk (IP based)

## 4. Enter the SIP Trunk Number

Enter the main number given by your provider.

For example:

```
02112345678
```

This number becomes the SIP Trunk's identity in 3CX.

## 5. Fill in the Provider's Details

Enter the details your provider gave you, such as:

- Registrar/Server
- SIP Username
- Authentication ID
- Password

Make sure all the details are correct so registration succeeds.

## 6. Save the Settings

Click **Save**.

3CX will try to connect to the provider's server.

If it succeeds, the SIP Trunk status will change to:

✅ Registered

That means the phone number is now active in 3CX.

## How to Check If the SIP Trunk Worked

Go back to the **SIP Trunks** menu.

Check the status.

## If you see:

✅ Registered

Everything is working normally.

If you see:

- Not Registered
- Offline
- Failed

That means there's a configuration issue to check.

## Why a SIP Trunk Fails to Connect

If the SIP Trunk won't connect, the cause is usually one of these:

- Wrong username or password

Double-check that the provider's details are entered correctly.

- Wrong SIP server

Recheck the SIP server address given by your provider.

- Firewall blocking the connection

A misconfigured firewall can prevent 3CX from communicating with the SIP server.

- Unstable internet

Since a SIP Trunk runs over the internet, a spotty connection can cause the status to show as Offline.

## Tips to Keep Your SIP Trunk Stable

To keep communication running smoothly, follow these tips:

- Use a stable internet connection.
- Use the firewall settings recommended by 3CX.
- Check the SIP Trunk status regularly.
- Keep your provider's configuration details as a backup.
- Test calls after making any configuration changes.

## Why Use a SIP Trunk with 3CX?

Using a SIP Trunk together with 3CX offers many benefits, such as:

- Your office number stays professional.
- Usable on a laptop, smartphone, or IP Phone.
- More cost-effective than conventional phone lines.
- Easy to manage from a single dashboard.
- Supports hybrid and remote work.

> # Conclusion

Connecting a **SIP Trunk** to **3CX** isn't as complicated as it sounds. As long as the provider's details are correct and your internet connection is stable, the whole setup can be done in just a few steps.

With a SIP Trunk, your office phone number becomes far more flexible since it can be used on multiple devices without relying on a physical phone. The result is business communication that's more practical, more professional, and ready to support work from anywhere.