To change the number of attempts that are made before the system gives up faxing, do the following:
Go to 'Fax Console' (Click Start > All Programs > Accessories > Communications > Fax > Fax Console).
Click 'Tools' > 'Fax Printer Configuration'.
Click the 'Devices' Tab.
Select your modem from the list.
Click 'Send' Tab. There is a space to change the number of retries. Enter any number that you want.