Axis Communications RightFax 8.5 - Manual (Page 18)

Transmission Success and Failure
A successful fax transmission is not defined by how the information was actually
received at its destination. Instead, RightFax considers a transmission successful
if RightFax successfully made the connection, transmitted the information across
the line, and received information from the target fax machine that indicated fax
information was received.
If for some reason a transmission attempt is unsuccessful, RightFax will display
the code “ER” (error-retry) and a brief error message in the Status column in you
FaxUtil mailbox. After a certain number of attempts (five by default),
RightFax will stop trying, consider the transmission failed, and display the code
“ED” (error-dropped) in the status column of FaxUtil. A message appears stating
that the transmission failed.
RightFax 8.5 User Guide 18