Specifications

SIM900 AT Commands Set
SIM900_ATC_V1.01 52 23.06.2010
If <mode>≠2 and Command successful
OK
If <mode>=2 and Command successful
+CCWA :<status>,<class1>[<CR><LF>+CCWA:<status>,<class2>[...]
]
OK
Note: <status>=0 should be returned only if service is not active for any
<class> i.e. +CCWA: 0, 7 will be returned in this case.
When mode=2, all active call waiting classes will be reported. In this mode
the Command is abortable by pressing any key.
If error is related to ME functionality:
+CME ERROR: <err>
ERROR
Parameters
<n> 0 disable presentation of an unsolicited result code
1 enable presentation of an unsolicited result code
<mode> when <mode> parameter not given, network is not
interrogated
0 disable
1 enable
2 query status
<class> is a sum of integers each representing a class of information
1 voice (telephony)
2 data (refers to all bearer services; with <mode>=2 this
may refer only to some bearer service if TA does not
support values 16, 32, 64 and 128)
4 fax (facsimile services)
7 default(1+2+4)
<status> 0 not active
1 enable
Unsolicited result code
RING
+CCWA: <number>,<type>,<class>[,<alpha>]
Parameters
<number> string type (string should be included in quotation marks)
phone number of calling address in format specified by
<type>
<type> type of address octet in integer format;
129 Unknown type(IDSN format number)
161 National number type(IDSN format)