Specifications

SIM900 AT Command Manual
SIM900_AT Command Manual_V1.03 135 12/24/2010
DCS_MODE
PCS_MODE
EGSM_DCS_MODE
GSM850_PCS_MODE
ALL_BAND
Reference Note
Radio settings are stored in non-volatile memory.
6.2.21 AT+CHF Configure Hands Free Operation
AT+CHF Configure Hands Free Operation
Response
+CHF: (list of supported <ind>s),( list of supported <state>s)
OK
Test Command
AT+CHF=?
Parameters
See Write Command
Response
+CHF: <ind>,<state>
OK
Read Command
AT+CHF?
Parameters
See Write Command
Response
OK
ERROR
If error is related to ME functionality:
+CME ERROR: <err>
Write Command
AT+CHF=<in
d>[,<state>]
Parameters
<ind> 0 Unsolicited result code disabled
1 Unsolicited result code enabled
(non-volatile)
<state> 0 main audio handset channel
1 aux audio headset channel
2 main audio handfree channel
3 aux audio handfree channel
(volatile)
Reference Note
This command is related to the actual module.
6.2.22 AT+CHFA Swap the Audio Channels
AT+CHFA Swap the Audio Channels