Oki OKIFAX 5750 Service Manual page 610

If "redial" is applicable, the redial operation is entered depending on the number of redial times.
If the redial operation cannot be entered (i.e. the number of redial times is 0 or the residual number of redial times is 0), Alarm=ON and Result=BUSY occur as
with PSTN.
If "G3 fallback" is applicable, the dial operation in G3 mode is entered.
If a service code to which "G3 fallback" is applicable occurs regardless of dialing in G3 mode, a communication error is assumed and Alarm=ON and Result=NG
occur.
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