/usr/sbin/faxsend is in capi4hylafax 1:01.03.00.99.svn.300-20build1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 | #! /bin/bash
isdev=0
for a; do
    if [ x"$isdev" == x'1' ]; then
	isdev=0
	dev="$a"
    elif [ x"$a" == x'-m' ]; then
	isdev=1
    fi
done
case "$dev" in
   faxCAPI*)
	exec /usr/bin/c2faxsend "$@"
   ;;
   *)
	exec /usr/sbin/faxsend.hylafax "$@"
   ;;
esac
 |