With Avantfax 3.3.3 (don\'t know if also earlier versions), when forwarding a fax from the archive, the refax.php page opens without the cover page checkbox checked and without the cover page fields correctly prefilled.
This is due to a little error in refax.php at line 293
Attached is the patch that resolves this bug.
Patch to correctly prefill coverpage fields in refax.php