GPRS/EDGE
3-374 AT Commands Reference Manual December 31, 2007
Send DTMF
This proactive SIM service command requests the G24 to send a DTMF string after successfully
establishing a call. This command can be used at any time during a call. The G24 does not locally
generate audible DTMF tones to play to the user.
This command can be activated/deactivated by the user using the command +MTKP=24. The
setting defined by the user is retained during the currently active call and is restored after a power
cycle. If a DTMF command is sent to the G24 while this command is disabled, the G24 sends an
"Unable to process" terminal response to the SIM.
The terminal response indicating that the command has been performed successfully is sent after
the complete DTMF string is sent to the network by the G24. If the command is sent in idle mode,
or if a call is terminated or put on hold before the complete DTMF string is sent to the network,
the G24 informs the SIM using terminal response 20, with the additional information "Not in
speech call". If the user indicates the need to end the proactive SIM application session while the
G24 is sending the DTMF string, the G24 stops sending the string and sends the following
terminal response, "Proactive SIM application session terminated by the user".
If the SIM includes an alpha identifier in the command, the G24 displays this string for the user in
the form of a +MTKP unsolicited response. In all other cases, no information is sent to the user.
Command Type Syntax Response/Action Remarks
Set
+MTKP=24,<enable
/disable>
OK
or:
+CME ERROR: <err>
The Set command
activates and deactivates
the send DTMF
command.
Unsolicited
Response
+MTKP=24,<alpha identifier
string>
Read
+MTKP? +MTKP: 24,<status>
The Read command
displays the current status
of the send DTMF
command.
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