Need hylafax.service for systemd?

I've created 4 faxgetty.service files for my 4 IAXmodems as described on various posts, for my CentOS 7 system (which uses systemd)


What I'm not clear on, is do I also have to create a hylafax.service to start hylafax?


The hylafax web site talks about adding "/usr/sbin/hylafax start" to rc.local, which makes me thing I have to start a hylafax executable too.  I created I hylafax.service like this...but is it necessary?


[Unit]
Description=HylaFAX

[Service]
User=root
Group=root
Restart=always
RestartSec=30
ExecStart=/usr/sbin/hylafax start
ExecStop=/usr/sbin/hylafax stop

[Install]
WantedBy=multi-user.target