AOpen FM56-ITU/2 Manual page 58

#CLS=0 Data. This is similar to setting +FCLASS=0,and instructs
the modem to act like a data modem on subsequent answer or originate
operations. When a disconnect or inactivity time out in the non-autobaud mode is
detected, the modem automatically sets the #CLS setting to 0 and hangs up.
This ensures that the modem is always in a known state despite disorderly DTE
behavior.
#CLS=1 Class 1 fax. This is similar to setting +FCLASS=1, and
instructs the modem to be a Class 1 fax modem. Once this is set, either the
+FAA or +FAE command can be used to force subsequent answers to be Class
1 adaptive answers.
#CLS=2 Class 2 fax. This is similar to setting +FCLASS=2, and
instructs the modem to be a Class 2 fax modem. Once this is set, the +FAA
command can be used to force subsequent answers to be Class 2 adaptive
answers.
#CLS=8 Voice Mode. This is the main setting the DTE uses to effect
directed or adaptive answer or originate sequences involving voice modes. All
telephone calls initialized by #CLS=8 result (after answer or successful call
progress) in the modem in Online Voice Command Mode.
AT#MDL? Identify Model
This command requests the model number or name of the modem.
AT#MFR? Identify Manufacturer
This command requests the modem manufacturer.
AT#REV? Identify Revision
The #FREV? command requests the revision level of the modem. The
message format is the same as the ATI3 message.
AT#VBQ? Query Buffer Size
This query-only command returns the size of the modem's voice
transmit and voice receive buffers in ASCII decimal, followed by the OK result
code.
AT#VBS Bits Per Sample (Voice Compression Factor)
This command selects the degree of ADPCM voice compression to
be used.
Parameters:
#CLS=n 0
1 Fax class 1 mode
2 Fax class 2 mode
8 Voice mode
n=2, 3, or 4 (Voice compression bits per
Data mode