Im sending fax using windows xp fax(service pack 3) from vb.net application. there is no issue with receiving the fax. while sending the fax its always(15 out of 20) giving error. I found the error code in log file is "0x00000009". if i try to send 17 pages of fax, sometime its sending only 13 pages then after error. if we use to send the same through normal fax machine its going fine without any error. iam using US Robotics modem (USB)