Comtrol AT Commands - Manual (Page 9)

AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
102184B Conexant ix
+VSP - Speakerphone ON/OFF ............................................................................................................. 5-23
+VDX - Speakerphone Duplex Mode .................................................................................................... 5-24
+VGM - Microphone Gain..................................................................................................................... 5-25
+VGS - Speaker Gain ............................................................................................................................ 5-26