At+Cecm Adjust Echo Canceller - SimCom SIM7500 Series At Command Manual

command only be used during call and don't save the parameter after call.
SIM PIN References
NO Vendor
Syntax
Test Command
AT+CNLPPL=?
Read Command
AT+CNLPPL?
Write Command
AT+CNLPPL =<value>
Defined values
<value>
Value from 0x0000-0x7fff, default value is not a fixed value. It varies with different versions.
Examples
AT+CNLPPL=0x1234
OK
AT+CNLPPL?
+CNLPPL: 0x7fff
OK
6.43

AT+CECM Adjust echo canceller

Description
This AT command is used to select the echo cancellation mode. Write command only be used
during call.
SIM PIN References
NO Vendor
Syntax
Test Command
AT+CECM=?
SIM7500_SIM7600 Series_AT Command Manual_V1.07
Responses
+CNLPPL: (list of supported <value>s)
OK
Responses
+CNLPPL: <value>
OK
Responses
OK
ERROR
Responses
+CECM: (list of supported <value>s)
Smart Machine Smart Decision
151 2017-12-25