Longshine LCS-8156C1 - Manual (Page 188)

AT Commands for CX930xx Modem Reference Manual
5-24 Conexant 102752B
+VDX - Speakerphone Duplex Mode
This command selects speakerphone full duplex mode.
Syntax
+VDX=<mode>
Defined Values
<mode> Decimal number corresponding to the selected option.
1 The speakerphone mode is full duplex.
Reporting Current or Selected Values
Command: +VDX?
Response: <mode>
Example: 1 For the default setting.
Reporting Supported Range of Parameter Values
Command: +VDX=?
Response: (<mode> range)
Example: (1)
Result Codes
OK <mode> = 1.
ERROR Otherwise, or if not in Voice Mode.