Fax Issue...

Question

Dear Friends, I have been using different kinds of faxing method on my application. I have tried to create XLS file and use the Window's lib to send... but the problem is that it open an application in my server window but not a service. I have tried RelayFax and ASPFax but they said my TIFF file is incompatible.... Does anyone can suggest me what to do to complete a fax module without opening any other software.. i.e. using service to send.... Thanks! LArry