Data Sheet

SIM900 AT Commands Set
SIM900R01_ATC_V1.00 77 15.01.2010
Parameters
see Write Command
Response
+CRC: <mode>
OK
Read Command
AT+CRC?
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=[<mod
e>]
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