Equisys technical notes

Technical guidance, explanations and fixes for our products

FIX: Brooktrout device controller incorrectly reports that voice answered call



ID: ZTN2097

This Zetafax technical note applies to:

  • Zetafax 2014 and Zetafax Version 17.0
  • Brooktrout SDK 6.7.1


Zetafax Server reports that a voice answered an outbound fax call when this is not the case (the line may be silent, or possibly busy in some circumstances). This results in a failed fax that is not retried.


This was caused by an incorrect detection of the status of the fax line. A ‘no loop current’ status was incorrectly interpreted as a voice answering the call.


This fault was corrected in a hotfix, which is available by contacting Equisys Technical Support and quoting the technote number ZTN2097. This hotfix correctly reports the ‘no loop current’ status and fails the fax in the correct way, allowing the fax message to be retried.

Please note that this hotfix requires Brooktrout SDK version 6.7.1.


This behaviour was corrected in the hotfix detailed above.

Last updated: 29th March 2016 (NT/JV) 

Keywords: Dialogic SR140 TR1034 TR114

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