Longshine LCS-8056C2 - Manual (Page 157)

Commands for Host-Processed Modems Reference Manual
100498E Conexant 5-25
+VGS - Speaker Gain
This command causes the modem to set the speaker gain of the speakerphone function.
Syntax
+VGS=
Defined Values
Decimal number between 0 and 255 corresponding to the gain.
Reporting Current or Selected Values
Command: +VGS?
Response: +VGS:
Example: +VGS: 130 For the default setting.
Reporting Supported Range of Parameter Values
Command: +VGS=?
Response: +VGS: range
Example: +VGS: 0-255
Result Codes
OK = 0-255.
ERROR Otherwise, or if not in Voice Mode with speakerphone enabled
(+VSP=1).