> For the complete documentation index, see [llms.txt](https://prosbcdocs.telcobridges.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://prosbcdocs.telcobridges.com/configuration-details/configuration-by-use-case/3cx-phone-provisioning-configuration/configuration-for-3cx-pbx-server-with-the-prosbc-as-sip-trunk.md).

# Configuration for 3CX PBX Server with the ProSBC as SIP trunk

## Introduction

This document provides instructions on how to configure 3CX PBX Server with the ProSBC as SIP trunk. Please visit the following link for more details about [Configuring SIP Trunks in 3CX PBX Server](https://www.3cx.com/docs/manual/sip-trunks/)

## 3CX PBX SIP Trunk Configuration

1 - Click to SIP Trunks in 3CX Web GUI and Click to Add SIP Trunk button

<figure><img src="https://docs.telcobridges.com/w/images/9/92/3CX_SIP_Trunk_1.png" alt=""><figcaption></figcaption></figure>

2 - From new menu select Generic for Select Country and Generic SIP Trunk for Select Provider in your Country

<figure><img src="https://docs.telcobridges.com/w/images/7/77/3CX_SIP_Trunk_2.png" alt=""><figcaption></figcaption></figure>

3 - Enter ProSBC IP Address in the Registrar/Server/Gateway Hostname or IP section. Set number of simultaneous calls allowed from this trunk in Number of SIM Calls

<figure><img src="https://docs.telcobridges.com/w/images/5/58/3CX_SIP_Trunk_3.png" alt=""><figcaption></figcaption></figure>

4 - In the Authentication Section select Do not require - IP Based

<figure><img src="https://docs.telcobridges.com/w/images/6/6c/3CX_SIP_Trunk_4.png" alt=""><figcaption></figcaption></figure>

5 - You can modify other settings as your network needs from DIDs, Caller ID, Options etc... sections.

6 - Click to OK


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