You can connect a fax machine to the second phone port on the adapter. However, it may or may not work. As somebody quipped, there is a reason it's called Voice over IP.

Depending on your needs (namely, how much outgoing faxes you send), Voipo cloud number maybe a solution. If not - take a look at these providers. I am using Extreme fax, and have had very good experience with them (Antidisclaimer: I am in no way affiliated with them, and have no financial interest whether you sign up or not).