HUAWEI MG323 GSM M2M Module
AT Command Interface Specification Commands for Audio Control
Issue 02 (2010-11-23) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd. 198
Parameter description
<level>: integer; indicates the microphone gain level; value range: –12 to +13;
Default value: 0.
z –12: minimum gain
z 12: maximum gain
z 13: microphone muted

15.2.2 Querying the Current Microphone Gain Level

Read
command
AT+CMIC?
Function Queries the current microphone gain level
Response z In case of successful execution:
<CR><LF>+CMIC: <level><CR><LF>
<CR><LF>OK<CR><LF>
z In case of an error: <CR><LF>ERROR<CR><LF>

15.2.3 Setting the Microphone Gain Level

Write
command
AT+CMIC=<level>
Function Sets the microphone gain level
Response z In case of successful execution: <CR><LF>OK<CR><LF>
z In case of an error: <CR><LF>ERROR<CR><LF>
z In case of an error related to the MT: <CR><LF> +CME ERROR:
<err><CR><LF>
Note:
This command applies to both audio channels, but it can be executed only before a voice call
is initiated.
15.3 AT^ECHO - Command for Suppressing the Echo
The AT^E CHO command suppresses the echo.