Specifications

SIM900 AT Commands Set
SIM900_ATC_V1.01 18 23.06.2010
NO ANSWER
If connection successful and non-voice call.
CONNECT<text> TA switches to data mode.
Note: <text> output only if ATX<value> parameter setting with the
<value> >0
When TA returns to Command mode after call release
OK
If connection successful and voice call
OK
Parameters
<n> string of dialing digits and optionally V.25ter modifiers
dialing digits:
0-9, * , #, +, A, B, C
Following V.25ter modifiers are ignored:
,(comma), T, P, !, W, @
Emergency call:
<n> Standardized emergency number 112(no SIM needed)
<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 <n> is default for last number that can be dialed by ATDL
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.
Responses returned after dialing with ATD
z For voice call two different responses mode can be determined. TA
returns “OK” immediately either after dialing was completed or after