unless you need 24 ports you dont need a VG224. You can always use FXS modules on your voice router assuming you have the open slots, DSP's and your faxes are not many. If you have a lot of faxes then VG is the way to go.
If you are refering to an ATA, you can use them for faxes but they were not intended for that purpose, although people use them for that all the time. Not recommended however.