AOpen FM56 Manual page 110

<level> Decimal number (0 and 255) corresponding to the volume level.
Reporting Current or Selected Values
Command: +VGT?
Response: +VGT: <level>
Example: +VGT: 0 For the default setting.
Reporting Supported Range of Parameter Values
Command: +VGT=?
Response: +VGT: <level> range
Example: +VGT: 0-255
Result Codes
OK <level> = 0-255.
ERROR Otherwise.
5.2.2.7 +VIT - Voice Inactivity Timer (DTE/Modem)
This command sets the modem's initial value for the DTE/modem inactivity timer.
Syntax
+VIT=<timer>
Defined Values
<timer> Decimal number(0 and 255) corresponding to the time in units of 1.0 second. A
value of 0
disables the timer.
Reporting Current or Selected Values
Command: +VIT?
Response: +VIT: <timer>
Example: +VIT: 0 For the default setting.
Reporting Supported Range of Parameter Values
Command: +VIT=?
Response: +VIT: <timer> range
Example: +VIT: 0-255
Result Codes
OK <timer> = 0-255.
ERROR Otherwise.
5.2.2.8 +VLS - Analog Source/Destination Selection
This command causes the modem to select one or more source/destinations of the
analog data.
Syntax
+VLS=<label>
Defined Values
<label> Decimal number corresponding to the selected option.
0 Modem on hook. Phone connected to line
1 Modem connected to line.
2 Modem connected to handset
3 Modem connected to line and handset
4 Modem connected to speaker
5 Modem connected to line and speaker
6 Modem connected to microphone
7 Speaker and microphone routed to line via modem
8 Modem connected to speaker
9 Modem connected to line and speaker
10 Speaker and microphone routed to line via Modem
11 Modem connected to microphone