Chapter 3:  AT Commands Reference
 April 15, 2008 G24-L AT Commands Reference Manual 3-275
The following table shows the +MTKA parameters.
Notes:For <n> = 0 (disable)
All messages should be sent to the TE automatically.
Sending AT+MTKA has not influence.
For <n> = 1 (enable)
The first proactive message "Display Text" (+MTKP:1,…) should be sent to the TE. Until 
the user send acknowledge (by sending AT+MTKA command), NO other proactive of 
"Display Text" (+MTKP:1,…) or Menu message (+MTKM:…) should be sent to the TE. 
Other proactive or unsolicited indications and messages (RING, +CLCC:.., +MTKP:10, 
…) should be sent automatically to the TE.
Example
AT+MTKA=?
+MTKA: (0,1)
OK
AT+MTKA=0         // set ACK to disabled
OK
AT+MTKA?
+MTKA: 0
OK
    // Example of receiving messages from STK, and no ACK is required:
…
+MTKP: 1,0,"!  YOUR RECHARGE OF TSH: 250.00 TO 0756706666 IS SUCCESSFUL"
+MTKP: 1,0,"Transaction successful!"
+MTKM: "VodaFASTA"
+MTKM: 96,5,Recharge,0
+MTKM: 97,5,Transfer,0
+MTKM: 98,5,Report,0
+MTKM: 99,5,Administration,0
+MTKM: 100,5,Exit,0
…
AT+MTKA=1      // set ACK to enabled
OK
AT+MTKA?
+MTKA: 1
OK
   // Example of receiving messages from STK, and ACK is required:
…
Table 3-194: +MTKA Parameters
<Parameter> Description
<n> Action type.
0 Disable (default).
1 Enable.