flexfax: retrain negative/resend?

[Darrell Berry <darrellb@hhcl.com>]

a numebr of destinations say they often receive 3 or 4 apparantly
complete faxes for each send form hylafax...this appears to depend on
the recipient's fax system, and seemingly the only thing the logs have
in common is somehting like:

Feb 01 16:52:46.75: [ 9605]: SEND send EOP (no more pages or documents)
Feb 01 16:52:46.75: [ 9605]: <-- data [2]
Feb 01 16:52:52.90: [ 9605]: --> [5:ERROR]
Feb 01 16:52:52.90: [ 9605]: SEND recv RTN (retrain negative)
Feb 01 16:52:52.90: [ 9605]: <-- [7:AT+FDT\r]
Feb 01 16:55:52.90: [ 9605]: MODEM <Timeout>

is this a hylafax problem?

what does it mean?

is there anything i can do?

thnx