My new PC does not have internal modem card. I use Verizon FIOS Actiontec router #M1424-WR rev F. What do I have to do to use as modem for receiving and sending faxes? Do I now have to buy an external USB modem?
Your router is useless wrt faxing. You can only fax using a dial-up modem, whether internal or external, your choice. Of course, you could use an internet-based faxing "service" instead. You’d scan your documents into your computer, convert them to a supported format (usually PDF), and either email or upload them to the faxing service website.