Here is the REAL solution for this problem with Winfax and Windows XP with Service Pack 2 or newer...and there's NO subscription charged for this solution like
www.getfaxing.com tries to get you to do...
1. Go to Control Panel, then Regional and Language Options.
2. Click the Languages tab, then press the Details button.
3. Next, click the Advanced tab.
4. Put a check in the box: "Turn off advanced text services"
5. Restart your computer, start Winfax, and VOILA! Enter your numbers.