How to Use Your Own SSL & FQDN Certificate with V15

How to use your won SSL and FQDN certificates with 3CX V153CX v15 includes the option of 3CX to manage FQDN & SSL certificates at no extra charge. For many companies it is preferable to manage the PBX via their own Domain Server and Domain. For those installations a certificate needs to be provided during the installation of 3CX stating the desired FQDN for the PBX.

In order to do this there are certain prerequisites that need to be met, these are:

  • You must own your own public domain name (e.g.
  • You must own your own public manageable DNS (e.g. Google Cloud DNS)
  • You must have an FQDN certificate (e.g.

Additionally, there are two major types of certificates:

  • Self signed certificates
  • Publicly trusted certficates

There are some major differences between the two, and provisioning of remote extensions is one of them.

To read more about how you can configure your own certificate with 3CX V15 and the 3 different scenarios of doing so please read our guide on V15: How to Use your Own SSL & FQDN Certificate.

For any comments please post them in the comment box below.

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  1. 1. Will it be possible to renew an own publicly trusted certificate without reinstalling the PBX ?
    2. Is it possible to install 3CX V15 with self-signed certificate ?

    July 14, 2016 at 5:15 pm
    • Hey Orlin

      1) Yes it is possible but not from the interface and given that you are firm with SSL Certs in it self. Have a look at C:\Program Files\3CX Phone System\Bin\nginx\conf\instance1 and it will be clear to you.

      2) If it tech possible? Sure, we do not validate what type of cert it is, but time changes and it is not good practice anymore, causing issues with STUN and SBC extensions in provisioning and surly RPS is out of the windows.. (surly better then nothing)

      July 14, 2016 at 5:38 pm
  2. In your example shown above, you have used Are you suggesting that it ok to use 3cx in the domain? The FAQ listing on this page clearly says: “3CX is a registered trademark and without written permission from 3CX sites with 3CX in their domain are illegal.” Can you please clarify what is correct?

    July 16, 2016 at 1:44 pm
    • there is no issue calling your PBX ‘3CX.XYZ.TLD’ and is fully allowed. However the use of ‘pbx.3CX-XYZ.TLD’ is a different story as this is part of the domain in that case. So feel free to give your pbx the host part 3cx address.

      July 18, 2016 at 9:30 am