Specifications

SIM900 AT Command Manual
SIM900_AT Command Manual_V1.03 56 12/24/2010
3.2.13 AT+CSTA Select Type of Address
AT+CSTA Select Type of Address
Response
+CSTA: (list of supported <type>s)
OK
Test Command
AT+CSTA=?
Parameter
See Write Command
Response
+CSTA: <type>
OK
Read Command
AT+CSTA?
Parameter
<type> Current address type setting.
Response
OK
If <type> is not in the parameter range:
ERROR
Write Command
AT+CSTA=<type
>
Parameter
<type> Type of address octet in integer format;
129 Unknown type (IDSN format number)
161 National number type (IDSN format)
145 International number type (ISDN format )
177 Network specific number (ISDN format)
Reference
GSM 07.07 [13]
Note
The ATD Command overrides this setting when a number is dialed.
3.2.14 AT+CHLD Call Hold and Multiparty
AT+CHLD Call Hold and Multiparty
Response
+CHLD: (list of supported <n>s)
OK
Test Command
AT+CHLD=?
Parameter
See Write Command
Write Command
AT+CHLD=<n>
Response
TA controls the supplementary services Call Hold, Multiparty and Explicit