Specifications

SIM900 AT Commands Set
SIM900_ATC_V1.01 77 23.06.2010
OK
Parameter
see Write Command
Response
TA controls whether or not the extended format of incoming call
indication is used.
OK
Parameter
<mode> 0 Disable extended format
1 Enable extended format
Write Command
AT+CRC=<mode
>
Unsolicited result code
When enabled, an incoming call is indicated to the TE with unsolicited
result code +CRING: <type> instead of the normal RING.
Parameter
<type> ASYNC asynchronous transparent
SYNC synchronous transparent
REL ASYNC asynchronous non-transparent
REL SYNC synchronous non-transparent
FAX facsimile
VOICE voice
Reference
GSM 07.07 [13]
Note
3.2.32 AT+CREG Network Registration
AT+CREG Network Registration
Response
+CREG: (list of supported <n>s)
OK
Test Command
AT+CREG=?
Parameters
see Write Command
Read Command
AT+CREG?
Response
TA returns the status of result code presentation and an integer <stat>
which shows whether the network has currently indicated the registration
of the ME. Location information elements <lac> and <ci> are returned
only when <n>=2 and ME is registered in the network.
+CREG: <n>,<stat>[,<lac>,<ci>]
OK
If error is related to ME functionality: