Hi Jaime,
> I could send the fax from my app in the server, but couldn't run it from the workstation...
This is not a Windows 2003 Web Edition server, isn't it? The web edition doesn't support fax sharing. In any other case you first need to get this working interactively. Check out the following article that describes the process of setting up a Windows 2003 server as a fax server:
http://techrepublic.com.com/5100-1035_11-5148992.html#
--
Christof