# SIP Trunk Configuration Instruction with 3CX

## Introduction

This SIP Trunk Configuration Instruction with a 3CX Example Configuration provides you with a step-by-step SIP Trunk Configuration of ProSBC with 3CX systems, using the Web Portal configuration tool. Complete the general installation configuration steps, before you begin configuring your specific scenario. In this guide FQDN (telcobridges.3cx.ca) is configured in the 3CX server. Learn how to configure the SIP Trunk in 3CX for ProSBC from [Adding ProSBC as a SIP Trunk in 3CX Server](/configuration-details/configuration-by-use-case/3cx-phone-provisioning-configuration/configuration-for-3cx-pbx-server-with-the-prosbc-as-sip-trunk.md)

## 3CX SIP Trunk Example

<figure><img src="https://docs.telcobridges.com/w/images/thumb/a/a3/3CX_SIP_Trunking_1.png/800px-3CX_SIP_Trunking_1.png" alt=""><figcaption></figcaption></figure>

**Configuration Steps**

| <p>(Step 1)<br>Create IP Network</p>                                                                                                                                                                                                                                                                                  | <p>(Step 2)<br>Create Protocol Stack</p>                                                                                                                                                                                                                                                                                                                                       | <p>(Step 3)<br>Create Call Route</p>                                                  |
| --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | ------------------------------------------------------------------------------------- |
| <ul><li><a href="/pages/4Da0Y3tkR3YPkiQiMJq4">Configuring an IP Virtual Port</a></li><li><a href="/pages/7IjxZtyxERk988tkvjsb">Configuring a VLAN</a></li><li><a href="/pages/ZYQWWTQHLo88LCavuZ5C">Configuring IP Interfaces</a></li><li><a href="/pages/NQKpeugKPfvYlTTGh7AK">Create an IP port range</a></li></ul> | <ul><li><a href="/pages/NQKpeugKPfvYlTTGh7AK">Create an IP port range</a></li><li><a href="/pages/VG69umnT77U6581Yi96D">Create a SIP stack</a></li><li><a href="/pages/jvLDDqDqfgCJs0rS860W">Create a SIP transport server</a></li><li><a href="/pages/0aNbDh4Fvt05NbBm5vzb">Modify profile</a></li><li><a href="/pages/caC9hju5KNDcBruRFiOH">Allocate a SIP NAP</a></li></ul> | <ul><li><a href="/pages/d4TYj9I5RiFaLe6xDXIx">Create a first call route</a></li></ul> |

## NAP Configuration

* See [Create SIP NAP](/configuration-details/configuration-by-web-portal-category/network-access-points-nap.md)
  * At this point, you must create two NAPs, one SIP NAP will be a 3CX NAP, and the other NAP will be for a SIP trunk provided by the ITSP.


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