The filter program processes tif files by:

   cat - | tiff-to-pnm.fpi | pnm-to-ps.fpi | ps-to-printer.fpi

But, tiff-to-pnm.fpi only converts the *first* page of a tiff file to a pnm
file, so the above only prints the first page of the fax.  The solution is
to use tiff2ps instead of tifftopnm by addding a tiff-to-ps.fpi to
/usr/lib/rhs/rhs-printfilters which looks like:

#!/bin/sh
#
# takes tiff from stdin, writes postscript to stdout
#

TMPFILE=`mktemp /tmp/printtmp.XXXXXX` || exit 1
cat > $TMPFILE
tiff2ps -a $TMPFILE
rm -f $TMPFILE

exit 0


This also has the advantage of making the print chain one step shorter.