Commands (FAX Class 1)
All of the Class 1 commands and responses defined in [1] are implemented
in Hayes FAX Class 1 modems.
Reference 1 includes V.17 and other modulations. If the modem does not provide
a modulation, then the modem returns the ERROR result code to any command
that invokes the missing modulation.
The value of register S86 is set to 1 if a hang-up
occurs while the modem is in the FAX mode.
FAX Class 1 action commands are valid only while the modem is off hook.
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