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2. CALL CONTROL
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LZT 123 7361 R1B
2.11 AT+CVHU Voice Hang-Up
Selects whether ATH or “drop DTR” causes a voice connection to be
disconnected or not. Voice connection also includes alternating mode
calls that are currently in voice mode.
Note! When <mode>=2, this command must be viewed in conjunction with
the V.25ter command &D, or &D will be ignored.
2.12 AT+VTS DTMF and Tone Generation
This command allows the transmission of DTMF tones. These tones
may be used, for example, when announcing the start of a recording
period. The command is write only. In this profile of commands, the
command does not operate in data or fax modes of operation
(+FCLASS=0,1,2-7).
Note! The ATD-command is used only for dialing. It is not possible to
generate arbitrary DTMF tones using the ATD command.
Description Command Possible Responses
Set Command +CVHU=[<mode>] • +CME ERROR: <err>
•OK
Read command +CVHU? • +CVHU: <mode>
• +CME ERROR: <err>
Test if the command is
supported
+CVHU=? +CVHU: (list of supported
<mode>s)
<mode> Description
0 “Drop DTR” ignored but OK response given. ATH disconnects
1 “Drop DTR” and ATH ignored but OK response given
2 “Drop DTR” behavior according to &D setting. ATH disconnects.
Default value
Description Command Possible Responses
Request transmission of
DTMF tone(s)
AT +V T S= <D T MF > OK
ERROR
Show if the command is
supported
AT +V T S= ? OK
ERROR