COM AT+CMUT: Mute control
AT+CMUT=?
WAIT FOR OK
COM get current value
AT+CMUT?
WAIT FOR OK
MESSAGE Please establish a phone call to your mobile now. Press OK when ready...
COM set mute to 1
AT+CMUT=1
WAIT FOR OK
COM verify if value is 1
AT+CMUT?
WAIT FOR +CMUT: 1
MESSAGE Check mobile display: Microphone should be switched off now.
COM set mute to 0
AT+CMUT=0
WAIT FOR OK
MESSAGE Check mobile display: Microphone should be switched on again now. Call will be terminated after 'OK'... 
COM verify if value is 0
AT+CMUT?
WAIT FOR +CMUT: 0
COM HANG UP
ATH
WAIT FOR OK

