Specifications

SIM900 AT Commands Set
SIM900_ATC_V1.01 23 23.06.2010
Parameters
<str> string type(string should be included in quotation marks)
value (“x“), which should equal to an alphanumeric field in
at least one phone book entry in the searched memories. str
formatted as current TE character set specified by +CSCS.
<mgsm> string of GSM modifiers:
I Actives CLIR (Disables presentation of own number
to called party)
i Deactivates CLIR (Enable presentation of own number
to called party)
G Activates Closed User Group invocation for this call
only
g Deactivates Closed User Group invocation for this call
only
<;> only required to set up voice call , return to Command state
Reference
V.25ter
Note
z Parameter “I” and “i” only if no *# code is within the dial string
z *# codes sent with ATD are treated as voice calls. Therefore, the
Command must be terminated with a semicolon “;”
z See ATX Command for setting result code and call monitoring
parameters.
2.2.6 ATDL Redial Last Telephone Number Used
ATDL Redial Last Telephone Number Used
Execution
Command
ATDL
Response
This Command redials the last voice and data call number used.
Note: This Command may be aborted generally by receiving an ATH
Command or a character during execution. The aborting is not possible
during some states of connection establishment such as handshaking.
If error is related to ME functionality
+CME ERROR: <err>
If no dial tone and (parameter setting ATX2 or ATX4)
NO DIALTONE
If busy and (parameter setting ATX3 or ATX4)
BUSY
If a connection cannot be established
NO CARRIER