Multi-Tech Systems MMCModem GPRS (MTMMC-G) - Manual (Page 26)

Chapter 5 – Call Control Commands
Multi-Tech Systems, Inc. Wireless GSM/GPRS AT Commands (Document Number S000293I) 26
Microphone Mute Control +CMUT
Description: This command mutes the microphone input on the product (for the active microphone set with the
+SPEAKER command). This command is only allowed during a call.
Values:
0 microphone mute off (default value).
1 microphone mute on.
Syntax: AT+CMUT=
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 specific command selects the speaker and the microphone set.
Values:
0 Speaker One, Micro One
1 Speaker Two, Micro Two
Syntax: AT+SPEAKER=
Command Possible responses
AT+SPEAKER=0
Note: Speaker ONE and Micro ONE OK
Note: Command valid
AT+SPEAKER?
+SPEAKER: 0
OK
Note: Speaker ONE and Micro ONE are active
AT+SPEAKER=? +SPEAKER: (0,1)
OK