Specifications

SIM900 AT Command Manual
SIM900_AT Command Manual_V1.03 132 12/24/2010
OK
Response
OK
ERROR
Write Command
AT+CLDTMF=<
n>[,<DTMF
string>]
Parameters
<n> a numeric parameter(1-100) which indicates the duration of all
DTMF tones in <DTMF -string> in 1/10 secs
<DTMF -string> a string parameter (string should be included in
quotation marks) which has a max length of 20 chars of form
<DTMF>, separated by commas.
<DTMF> A single ASCII chars in the set 0-9,#,*,A-D.
Execution
Command
AT+CLDTMF
Response
OK
Abort any DTMF tone currently being generated and any DTMF tone
sequence.
Reference Note
6.2.17 AT+CDRIND CS Voice/Data Call Termination Indication
AT+CDRIND CS Voice/Data Call Termination Indication
Response
+CDRIND: (list of supported <n>s)
OK
Test Command
AT+CDRIND=?
Parameter
See Write Command
Response
+CDRIND: <n>
OK
Read Command
AT+CDRIND?
Parameter
See Write Command
Response
OK
ERROR
Parameter
<n> a numeric parameter to enable an unsolicited event code
indicating whether a CS voice call, CS data has been
terminated.
0 disable
1 enable
Write Command
AT+CDRIND=<
n>
Unsolicited result code