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Faxing Using Voice Over Internet Protocol (VOIP)

Document ID:SO3657

Usergroup :External


Not sending faxes; Not receiving faxes


Voice Over Internet Protocol (VOIP); Faxing; X34x Family; VOIP system installed


What You Will See

After a Voice Over Internet Protocol (VOIP) system is installed, the MFP will no longer send or receive faxes. 


Lexmark cannot guarantee compatibility with all VOIP lines and services.  The VOIP system must satisfy the following requirements:

  • The line is capable of producing an analog dial tone.

  • The quality of the connection is suitable for fax transmission and reception. 

Be sure to contact your VOIP support to verify that the above criteria are met.  If you are still experiencing problems, please continue to Still Need Help? below.

Still Need Help? 

Please contact Lexmark Technical Support for additional information.  NOTE:  When calling for support you will need to know your printer model type and serial number. 
Please call from near the printer in case the technician asks you to perform a task involving the printer.

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