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. 200

15.3.3 Setting the Echo Suppressing Function

Write
command
AT^ECHO=<n>
Function Sets the echo suppressing function.
Reponse 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 errorrelated 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 call is
initiated.
15.4 AT+CLVL - Command for Adjusting the Speaker Volume
The AT+C LVL command adjusts the speaker volume.

15.4.1 Querying the Supported Speaker Volume Level

Test
command
AT+CLVL=?
Function Queries the supported speaker volume levels.
Response z In case of successful execution:
<CR><LF>+CLVL: (list of supported <n>s) <CR><LF>
<CR><LF>OK<CR><LF>
z In case of an error: <CR><LF>ERROR<CR><LF>
Parameter description
<n>: integer; value range: 0 to 5.
z 1: minimum volume
z 5: maximum volume
z 0: speaker muted
z 4: default value