I did a search first but could not find a link to this topic. I used my "USB ADSL-P Modem" from my son's 1st PC for the windows 7 fax set-up.It recognized the modem which is connected to the same analog telephone supply as my PC and gives the message that "all fax accounts are accessible".However, when I send a fax, {I'm testing it on "fax toy"} it shows in the outbox pending.If I go to tools,fax settings, the 'select a modem is "grayed-out". Should I do a system restore and and try the modem detection again?
First thing you might want to do is check the Windows 7 Compatibility website and see if the device is listed as being compatible. If it's there, you'll find it in the Hardware section under the manufacturer's name. Doing a system restore because something fails to work the first time is a little extreme I'd think. I'd delete the device, reboot and see what happens. And check the website. One of my machines has an internal Fax-Modem and it works fine. So I know 7 does support at least one of them.
Don't think it is possible, Fax requires an analogue Fax Modem you need to send dialtone to dial number for fax.
It's impossible. Fax Modem send data as analog signal but ADSL Modem/Router send/receive data as digital signal. If Phone/Fax signal and ADSL signal have the same line, you need a filter/spliter to join/split analog signal with/from the line to use with Phone/Fax device.