Mode Switching (Voice)
Voice to FAX
If the modem is in Online Voice Command Mode (i.e., it has gone off-hook
with #CLS=8 in effect), the DTE can attempt a FAX handshake by setting #CLS=1
or #CLS=2, followed by the A or D command corresponding to FAX receive or
send. This has the effect of beginning a FAX Class 1 or Class 2 handshake.
Unsuccessful FAX Connection Attempt to Voice
A FAX handshake which does not succeed, attempted as the result of the
DTE modifying the #CLS setting from voice (8) to FAX (1 or 2), does not
result in the modem hanging up, allowing the DTE the flexibility of commanding
a switch back to Voice Mode with #CLS=8.
Voice to Data
If the modem is in the Online Voice Command Mode, the DTE can attempt
a data handshake by setting #CLS=0 followed by the A or D command. This
has the effect of beginning a Data Mode handshake according to the current
Data Mode S-register and command settings.
Unsuccessful Data Connection Attempt to Voice
A data handshake which does not succeed, attempted as the result of
the DTE modifying the #CLS setting from voice (8) to data (0), does not
result in the modem hanging up, allowing the DTE the flexibility of commanding
a switch back to Voice Mode with #CLS=8.
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