Specifications

Smart Machine Smart Decision
SIM900_AT Commands Manual_V1.07 141 2012.12.10
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>
Unsolicited Result Code
+CHF: <state>
Write Command
AT+CHF=
<ind>[,<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
Test Command
AT+CHFA=?
Response
+CHFA: (0 = NORMAL_AUDIO, 1 = HEADSET_AUDIO, 2 =
HANDFREE_AUDIO, 3 = HEADSET_HANDFREE_AUDIO)
OK