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How to Install & Setup 3CX SIP Trunking


This article demonstrates step-by-step instructions for setting up 3CX SIP Trunking with Circuit ID.

Step-by-Step Instructions

The below table will detail the steps required to accomplish your goals:



Login to the Management Portal by clicking a sign-on provider or entering your Email Address and Password as shown in Exhibit 1. If you don't have an account, you can sign signup instantly by clicking here.
Management Portal Login Form

Add your 3CX Server(s) to Circuit ID

Follow the How to Add your Server(s) to Circuit ID guide

Purchase Phone Numbers

Follow the How to Purchase Phone Numbers guide to purchase one (1) or more numbers.

Create a 3CX SIP Trunk 

Note: Configuring 3CX via the web client and management console differs slightly, but the required information is the same.  The below information is based on configuring 3CX via the web client.

  • Login to your 3CX web client or management console 
  • Next, tick the Admin button (or SIP Trunks if using the management console) , then Voice & chat (skip if using management console)
  • Click + Add Trunk and enter the following details:
    • Country: Generic
    • Trunk: Generic SIP Trunk
    • Main trunk number:  Enter the phone number you purchased in Step 3
    • Registrar / Server: g.pstn.circuitid.com
    • Authentication ID (SIP User ID): Leave blank
    • Authentication password: Leave blank
  • Tick the DID Numbers tab and add any additional phone numbers you purchased in Step 3
  • Click Save


Congratulations! You have now completed the "How-To Install & Setup 3CX Server with Circuit ID" article and we hope that you have accomplished the goals you set out to achieve. However, if for any reason you may still require assistance with setup, simply login to the Management Portal and submit a support request.

Updated on July 22, 2023

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