Comtrol AT Command Set Rev A - Manual (Page 221)

AT Commands Reference Manual
100722B Conexant 6-23
+VDX - Speakerphone Duplex Mode
This command selects speakerphone full duplex mode.
Syntax
+VDX=
Defined Values
Decimal number corresponding to the selected option.
1 The speakerphone mode is full duplex.
Reporting Current or Selected Values
Command: +VDX?
Response:
Example: 1 For the default setting.
Reporting Supported Range of Parameter Values
Command: +VDX=?
Response: ( range)
Example: (1)
Result Codes
OK = 1.
ERROR Otherwise, or if not in Voice Mode.