Vista system scanning fax failure solution

When attempting to send or receive a fax using Windows Fax and Scan in Windows Vista, the transfer process may not complete after the connection is established.
Fault Cause
This issue may occur if one of the following conditions is true: • There is line noise on the telephone line connected to the modem.
• Abnormal behavior of the modem.
• Timing issues have occurred between the computer and the modem.
Warning: Serious problems can occur if you modify the registry incorrectly by using Registry Editor or by other means. These issues may need to be reinstalled by xp to resolve the issue. Microsoft cannot guarantee that these issues will be resolved. Modifying the registry is at your own risk.
Workaround
In order to resolve this issue, you must use different class support to retransmit the fax. To do this, follow these steps:
1. Click “Start”, type device manager in the "Start Search" box, and then click “Device in the “Programs" Manager”.
2. Expand “Modem", right-click the modem you are using, and then click “Properties”.
3. On the "Diagnostics" tab, click “Query Modem”.
4. In the “Command” column, find “AT+FCLASS=?”, then write down the value in the "Response" column.
Note: If the value contained in the "Response" column is “1”,“2” or “2.0”, then the modem supports Class 1, Class 2, and Class 2.0, respectively.
5. Click “Start”, type regedit in the "Start Search" box, and then click “regedit” in the “Programs"
6. Locate and then click the following registry subkey:
HKEY_LOCAL_MACHINE\\Software\\Microsoft\\Fax\\TAPIDevices
7. Expand “TAPIDevices”, and then click the device ID of the modem.
8. Click “Modem”, right-click “FixModemClass”, then click “Modify”.
9. In the "Value data" box, type one of the following values ​​depending on the class you want to set: • Type 1 to set the fax modem to use class 1
• Type 2 will fax the modem Set to use class 2
• Typing 20 sets the fax modem to use class 2.0
10. Exit the Registry Editor.
11. Restart the fax service. To do this, click “Start”, type the service in the Windows System "Start Search" box, and then click “Service” in the list.
If you are prompted for an administrator password or for confirmation, type your password or click “Continue”.
12. In the "Services" list, click “Fax”, then click “Restart”.
13. Try to send a fax. If this problem occurs again, repeat steps 1 through 12 and set the modem to use a different class.