FRITZ!Box 7272 Service - Knowledge Base

FRITZ!Box 7272 Service

Integrated fax transmission fails occasionally or always fails

Although you configured the the integrated fax function according to our guide, fax transmission fails occasionally or always fails. You either cannot send faxes at all, or only part of the faxes is sent. When faxing fails, one of the following error messages may be displayed, or one of the following error messages may be displayed in the event log of the FRITZ!Box:

  • "Transmission failed [0x3301]."
  • "Transmission failed [3495]."
  • "Transmission failed (0x3490)."
  • "An error occurred while sending a fax. Fax transmission was unsuccessful or incomplete."
  • "An error occurred. Error description: Fax transmission failed. Please enter your data again. If the error occurs again, please consult AVM Support."
  • "Not Acceptable Here (488)"
  • "Unsupported Media Type (415)"
  • "Not Acceptable Here (606)"

Note:The configuration procedure and notes on functions given in this guide refer to the latest FRITZ!OS for your FRITZ!Box.

Simply proceed as described below. After each measure, check whether the issue persists.

1 Entering your location information

  1. Click "Telephony" in the FRITZ!Box user interface.
  2. Click "Telephone Numbers" in the "Telephony" menu.
  3. Click on the "Line Settings" tab.
  4. Select your country from the drop-down list under "Location Information". If your country is not included in the list, select "Other country".
  5. For the "Country code", enter the lead zeros in the first field and the country code in the second field (for example for Germany "00" and "49", see fig.).
  6. For the "Area code", enter the lead zero in the first field and the area code in the second field (for example for Berlin "0" and "30", see fig.).

    Fig.: Entering the country code and area code (e.g. for Germany and Berlin)

  7. Click "Apply" to save the settings and confirm that the procedure may be executed on the FRITZ!Box, if you are asked to do so.

2 Using a different web browser

The issue may be caused by the web browser (for example plug-ins may be interfering):

  • Test a different current web browser, for example Chrome or Firefox.

3 Testing different remote sites

  • Test whether you can send a fax to or from different fax machines connected to different telephone lines.
    • If fax transmission only fails with a particular line, then the fax machine at the remote site is either not ready to receive faxes or incorrectly configured.

4 Checking the event log of the FRITZ!Box

  1. Click "System" in the FRITZ!Box user interface.
  2. Click "Event Log" in the "System" menu.
  3. Select "Telephony" from the drop-down list.
  4. Check whether one of the following error messages is displayed for a failed fax. If this is the case, note the information that correspond to the message.
  5. If the message "Unsupported Media Type (415) is displayed, then your provider does not support the requested codec or generally does not allow fax transmission.
    • If the message "Not Acceptable Here (488 or 606)" is displayed, then your provider does not support the T.38 standard. Without T.38 (Fax over IP), fax transmission over the Internet is not reliable.

5 Checking whether T.38 was used for fax transmission

The following steps are only necessary if you would like to use an Internet telephone number to send and/or receive faxes:

  1. Click "Telephony" in the FRITZ!Box user interface.
  2. Click "Telephone Numbers" in the "Telephony" menu.
  3. Click on the "Voice transmission" tab. If the tab is not displayed, enable the Advanced View first.
  4. Look for aborted faxes under "Display table on completed telephone calls" and check whether "T.38" is displayed in the "Coding" column for these faxes:
  5. If "T.38" is displayed, then T.38 was used for the fax transmission.
    • If "T.38" is not displayed, then T.38 was not used. Without T.38 (Fax over IP), fax transmission over the Internet is not reliable.

      Note:If your Internet telephony provider does not support T.38, then you can use an Internet number of an Internet telephony provider that does support T.38 to receive faxes. If your FRITZ!Box is connected with a landline (analog or ISDN), you can also use a landline number instead of the Internet number to send faxes.