Hylafax dial-up problem

Running Gentoo Linux kernel 2.4.22, Hylafax 4.2.0-r1 from portage.

I have the following settings in /var/spool/fax/etc/

/var/spool/fax/etc/config.usb_tts_0: GettyArgs: "-b -r -s %s %l"

/var/spool/fax/etc/setup.cache: PATHEGETTY='/bin/false' /var/spool/fax/etc/setup.cache: PATHGETTY='/usr/sbin/mgetty' /var/spool/fax/etc/setup.cache: PATHVGETTY='/usr/sbin/vgetty'

To achieve this, I edited /usr/sbin/faxsetup and changed

PATH_GETTY=/sbin/agetty to PATH_GETTY=/usr/sbin/mgetty

then ran faxsetup.

When I dial in to the system, the log shows:

FaxGetty[4308]: GETTY: START "/sbin/agetty -b -r -s 19200 usb/tts/0", pid 4327

The only way I've been able to get dial-up to work is to rename /sbin/agetty and make it a symlink to /usr/sbin/mgetty.