Specifications

SIM900 AT Command Manual
SIM900_AT Command Manual_V1.03 75 12/24/2010
+CRC: (list of supported <mode>s)
OK
AT+CRC=?
Parameter
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
Unsolicited Result Code
When enabled, an incoming call is indicated to the TE with unsolicited
result code +CRING: <type> instead of the normal RING.
Write Command
AT+CRC=<mode
>
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=?
Parameter
See Write Command