BlueFax will not "lock" the system awaiting for retry if e.g. a busy is
received. The fax in question will be "pushed back" in the fax queue
according to the time limit set for the retry e.g. 180 seconds. The faxes
"waiting next in line" will be sent in between that time limit. This will
be done the number of times, you have set in the "Retry counter" e.g. 5
times.
If the fax have timed out, after say the 5 retries. It will be displayed in
the fax log with status "Error" and a manual action must be taken. Should a
phone call reveil that the receiving fax machine have been temporarily out
of order - you will only have to activate the fax by pressing "1=Resend".