About Fax Assure

What is Fax Assure?

The Fax Assure test verifies that your fax numbers are operational, and confirms that the devices are connected and receiving faxes as they should be. The inbound test is carried out across global fixed-lines, wherever Spearline has a presence. 


  1. The test dials your fax numbers from a Spearline in-country server.
  2. Using standard ISDN phone lines provided by local carriers in-country, we send a Tiff file to those numbers.
  3. During this process, we can detect if a number is experiencing issues with connectivity, post-dial delay (PDD), or the ability to receive a fax.
  4. After validating the problem, we will alert you to any issues before your customers are impacted.