This attribute indicates whether autobaud is active.
The modem is instructed at call setup time by the DMS-MTX on
the following:
(1) the initial modem data rate value, and
(2) whether a modem is allowed to perform autobauding (on) or not
(off).
With autobauding on, the modem is allowed to connect using a
valid modem data rate less than or equal to the initial rate specified
to the modem by the DMS-MTX. If a modem cannot perform
autobauding and the carrier cannot be established at the initial data
rate, the modem is disabled.