AT Commands Modem Terminated 151
ATO Return To On-line Data Mode
ATP Select Pulse Dialling
ATT Select Tone Dialling
AT+CVHU Voice Hang-up Control
Description: Switch from on-line command mode to on-line data mode during an active call.
Returns ERROR when not in on-line command mode.
Execution command: ATO[<value>]
Parameter:
<value>:
<value> Description
0 Return from on-line command state to on-line data state
Description: This command would normally cause the next ATD command to use pulses when
dialling the number, but it is ignored and is implemented for compatibility reasons
only.
Execution command: ATP
Test command: ATP=? Shows if the command is supported.
Description: This command would normally cause the next ATD command to use tones when
dialling the number, but it is ignored and is implemented for compatibility reasons
only.
Execution command: ATT
Test command: ATT=? Shows if the command is supported.
Description: Selects whether ATH or “drop DTR” shall cause a voice connection to be disconnected
or not.
Set command: AT+CVHU=[<mode>]
Read command: AT+CVHU? Displays the current <mode> setting.
Test command: AT+CVHU=? Shows if the command is supported.
Test command
response:
+CVHU: (list of supported <mode>s)
Parameter:
<mode>:
<mode> Description
0 “Drop DTR” is ignored but OK response given
ATH disconnects the call
1 “Drop DTR” and ATH ignored but OK response given
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