Specifications

SIM900 AT Commands Set
SIM900_ATC_V1.01 61 23.06.2010
1 mobile terminated (MT) call
<stat> state of the call:
0 active
1 held
2 dialing (MO call)
3 alerting (MO call)
4 incoming (MT call)
5 waiting (MT call)
<mode> bearer/tele service:
0 voice
1 data
2 fax
<mpty> 0 call is not one of multiparty (conference) call parties
1 call is one of multiparty (conference) call parties
<number> string type(string should be included in quotation marks)
phone number in format specified by <type>
<type> type of address
<alphaId> string type(string should be included in quotation marks)
alphanumeric representation of <number> corresponding to
the entry found in phone book
Reference
GSM 07.07
[13][14]
Note
3.2.17 AT+CLCK Facility Lock
AT+CLCK Facility Lock
Response
+CLCK: (list of supported <fac>s)
OK
Test Command
AT+CLCK=?
Parameters
see Write Command