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3CX SIP Trunk Guide

In this article


At the end of this article, you will be able to configure a SIP trunk from your 3CX PBX to the network. Should you need any assistance, feel free to contact our support department.


Configuring a SIP trunk to 3CX


The first process to getting your 3CX online is to log into your customer portal, then select the order services tab. From here expand the SIP trunk menu, add the number of channels you require and add a new SIP trunk, as outlined in the screenshot below. Ensure you accept the service terms and conditions then submit the order before continuing. 



Next, click on the PBX tab located in the top menu bar, drag and drop the SIP trunk object onto the main screen from the left-hand toolbox. Now, click on the settings icon and change the mode to create SIP registration.

After that, the SIP trunk details will be displayed as shown below. Please note the "allow override existing contact" checkbox. When enabled, any new SIP trunk registration will replace the old connection, preventing multiple registration attempts. This feature is useful when changes are made often to the SIP trunk. However, be aware that it might compromise security.




You will now need to log into your 3CX portal, select the SIP trunk option from the left-hand menu and add a new SIP trunk.




From the country drop-down list select 'generic' and the provider you must choose Asterisk. If required, you can include the main DID and then press ok.




Once you have added the trunk, enter the registration domain, SIP login, SIP password and the port number from the PBX portal to the 3CX trunk configuration. Lastly, double-check the information and save the configuration. Additionally, do not forget to add inbound routes for all DID's you have assigned to the SIP trunk to ensure inbound calls connect correctly. 




The final process is to test inbound and outbound calls to ensure they are working correctly, should you have issues with calls it is important you check you have configured the inbound and outbound routes correctly on your 3CX PBX.



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