To work around this issue, you must use a 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 Manager in the Programs list. 
2. Expand Modems, right-click the modem that you use, and then click Properties.
3. On the Diagnostics tab, click Query Modem.
4. In the Command column, locate AT+FCLASS=?, and then note the value in the Response column.

Note If the Response column contains a value of 1, 2, or 2.0, 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 Program list.
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, and then click Modify. 
9. In the Value data box, type one of the following, depending on the class that you want to set: • Type 1 to set the fax modem to use Class 1
• Type 2 to set the fax modem to use Class 2
• Type 20 to set the fax modem to use Class 2.0
 
10. Exit Registry editor.
11. Restart the fax service. To do this, click Start, type Services in the Start Search box, and then click Services in the Programs list.
 If you are prompted for an administrator password or for a confirmation, type the password or click Continue.
12. In the Services list, click Fax, and then click Restart.
13. Try to send the fax. If the issue occurs again, repeat steps 1 through 12 and set the modem to use a different class.