Syntax, Defined values, Reporting current or selected values – Comtrol AT Commands User Manual
Page 200: Reporting supported range of parameter values, Result codes

AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
Conexant
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+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.