New 3CX Fax Server Update: version 11344 for 3CX Phone System Version 8.10824

We are pleased to announce a new 3CX Fax Server Update which will be distributed via the 3CX Updates Server from within the 3CX Phone System Windows Management Console. The update improves the reliability of the fax service and increases the compatibility with VoIP providers. Please note that the fax service is RECEIVE ONLY

Instructions to update:

  1. Access the 3CX Phone System Computer using an administrator account and open the 3CX  Windows Management Console from the Start/All Programs menu shortcut. IMPORTANT: Updates work only via the Windows Management Console (Winforms) and not via the Web management console.
  2. Click on the tree node “3CX Phone System Updates”
  3. Click on “3CX Service Packs/Updates”
  4. You will see a new update named 3CX Fax Server Update. Select the checkbox and click the “Download Selected” button on the toolbar.
  5. The download will start, and the 3CX Fax Service will be updated automatically.

This patch has been extensively tested and proven to be very stable for receiving of Faxes. We have bulk tested this patch sending various amounts of Faxes with different pages ranging from 2 to 30 pages at random. We have also stressed the 3CX Fax Server sending 1 large fax of 120 pages that took 21 minutes to transfer and it was received and processed with success. Stress tests included sending 1000 faxes with random pages over a period of 7-8 hours (depending on the fax pages sent) sending approximately 2 faxes every minute from different fax machines.Memory usage was constant between 30-40 MB. CPU usage during bulk test was between 0-3%

We have also tested incoming faxes using VoIP Providers with successful results. Currently supported gateways and voip providers are:


  • Patton 4114, 4554, 4638, 4960
  • Grandstream 4104, 4108
  • Beronet (All models)
  • Fritzbox 7170


  • Broadvox
  • Prionet
  • Sipcall
  • Inode
  • Actio PL
  • VoIP Unlimited (Requires upgrade to account)
  • Inphonex (For this provider NAT configuration is needed. Click here for more information)
  • VozTelecom

The following is a list of providers that we tested and do not support T38. (These providers gave us back the message 488 Not Acceptable here)

  • VoIP ON
  • Voip Voice
  • PeoplePhone
  • Experio

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  1. Igor Snezhko

    Nick, what you means saying “Fax for Receive only”

    I successfully send faxes in this configuration

    Win XP Fax Client > Win Server 2003 Fax Server > 3CX Fax Module > Grandstream GXW 4104

    No any problem!

    March 24, 2010 at 11:35 pm
  2. Jonathan Hamon


    I can see the update to wich you refer and when I select it the download button is still greyed out. Any ideas or suggestions why?

    March 25, 2010 at 5:47 am
  3. Stefan Walther

    @Igor Snezhko
    this update it self only fixes issues with receiving faxes.
    The Fax Send Module is discontinued. It calls the same Server to send and has improved as well but we do not give any support on this module.

    March 25, 2010 at 9:22 pm
  4. Stefan Walther

    @Jonathan Hamon
    Do you use and pre-given version of the 3CX Phonesystem?
    It can may be that your version already include this update then.
    Is your PBX Version higher then v8.10824?
    If not please open a support ticket on us.

    March 25, 2010 at 9:25 pm
  5. Darr Palmer

    We are on the 3CXMININFR, I went to demo the inbound fax only to find that the fax server stops shortly after it is started. I went to download the update, but it is greyed out.

    Is this feature operational in the NFR?

    March 25, 2010 at 11:18 pm
  6. Nicky

    It is grayed out because you are accessing it from the web.
    You need to use WINFORMS Windows management console. The 3CX Interface that is not web but windows forms based. Start menu / all programs shortcuts.

    March 25, 2010 at 11:58 pm
  7. Darr Palmer – Contact me on – I want to see some files to see why it is stopping.

    March 26, 2010 at 6:49 pm
  8. A_M

    Thank you for this update! CBeyond is our VoIP provider, but receiving faxes via the 3CX PBX has not worked thus far. Are you planning to do ongoing testing of VoIP providers with the 3CX Fax Server? If so, where will you be publishing the results?

    March 27, 2010 at 9:02 am
    • Thanks for the feedback. Be sure to check whether Cbeyond actually supports T38 fax…. That may not be the case. I did a quick check on the Cbeyond website and it appears they have a fax to email service instead…

      March 27, 2010 at 10:23 pm
  9. A_M

    I appreciate your response, Nick. I will double-check that T38 is supported w/ CBeyond. Thanks again.

    March 28, 2010 at 7:35 am
  10. Using the windows form application, I do not have an option for “3CX Phone System Updates.” I can select “3CX Phone System” then “Settings” then “Phone System Updated” but everything shows up to date.

    It shows installed version is 8.0.10116.583. I don’t see any mention of service packs. We are having some issues with the fax service right now, I would like to install the update if there is one.

    April 1, 2010 at 9:01 am
    • You have to install the update on the 3CX Phone System server itself using the Windows Management Console option. This is for security reasons….

      April 1, 2010 at 12:04 pm
  11. Nicky

    In version 10116, system updates is not included. You have to install the latest version, 10824. This is the version has the system updates feature included.
    I suggest you install this version to benefit from future updates without uninstalling the 3CX Phone System.

    April 1, 2010 at 3:39 pm
  12. Neal Upton

    Updated and implemented per instructions in “how to” on several v.8 servers, and lost ability to hit voice mail from within auto attendant, but the fax in works really well. Is there another rev coming?

    April 6, 2010 at 8:48 pm
    • Nothing was changed in the voicemail / IVR. That is purely a Fax update. Can you double check this? What happens when you transfer a call to Voicemail from the IVR? Can you dial *4(EXTNUM)? Can you dial the voicemail extension from IVR?

      April 6, 2010 at 9:19 pm