If you wish to temporarily halt the reception of new incoming faxes on your fax number, you can make use of the fax reception feature by disabling it.
How can I enable or disable my fax reception? (Individual plans)
How can I enable or disable my fax reception? (Corporate plans)
Tip: The option to toggle your fax reception ON/OFF is only available to the users of the Premium, Business, or Enterprise plans. To access this feature, please upgrade your plan by visiting the Fax.Plus pricing page here.