Specifications

Chapter 4 – Call Control Commands
Multi-Tech Systems, Inc. CDMA AT Commands Reference Guide (PN S000294K) 27
Microphone Mute Control +CMUT
Description: This command is used to mute the microphone input on the product (for the active microphone set with the
+SPEAKER command). This command is only allowed during a call.
Values: <mode>
0 Microphone mute off (default).
1 Microphone mute on.
Syntax: Command syntax: AT+CMUT=<mode>
Command Possible Responses
AT+CMUT=?
Note: Test command
+CMUT : (0-1)
OK Note: Enable / disable mute
AT+CMUT?
Note: Ask for current value
+CMUT : 0
OK Note: Current value is OFF
AT+CMUT=1
Note: Mute ON (call active)
OK
Note: Command valid
AT+CMUT?
Note: Ask for current value
+CMUT : 1
OK Note: Mute is active (call active)
AT+CMUT=0
Note: Mute OFF (call not active)
+CME ERROR: 3
Note: Command not valid
Speaker & Microphone Selection +SPEAKER
Description: This command is used to select and activate a speaker/microphone audio path. The module provides two
audio paths. An audio path is functional only with appropriate module external hardware.
Values: <ActiveSpkMic >
0: HEADSET - Audio path corresponding to SPK_2/MIC_2.
1: HANDSET - Audio path corresponding to SPK_1/MIC_1. (Default)
Syntax: Command syntax: AT+SPEAKER=<ActiveSpkMic>
Command Possible Responses
AT+SPEAKER=0
Note: Select HEADSET audio path.
OK
Note: Command valid
AT+SPEAKER? +SPEAKER: 0
OK Note: HEADSET audio path active.
Echo Cancellation +ECHO
Description: This command is used to enable, disable or configure the Echo Cancellation functions for voice calls (in
rooms, in cars, etc.). The +SPEAKER function automatically sets echo cancellation based upon handset or
headset choice and this command allows non-standard operation.
Values: <mode>
0 Vocoder Echo Cancellation Off
1 Ear Seal Echo Cancellation
2 Head Set Echo Cancellation
3 AEC
4 Speaker Echo Cancellation for car kit operation
5 Default Echo Cancellation for current path settings
Syntax: Command syntax: AT+ECHO= <mode>
Command Possible Responses
AT+ECHO?
Note: Read current settings
+ECHO: 0
OK
AT+ECHO=0
Note: Set Echo Cancellation Off
OK
AT+ECHO=1
Note: Set Echo Cancellation to Ear Seal
OK
AT+ECHO=2
Note: Set Echo Cancellation to Headset
OK
AT+ECHO=4
Note: Set Echo Cancellation to Handset
OK