Specifications

SIM900 AT Command Manual
SIM900_AT Command Manual_V1.03 154 12/24/2010
word, if "AT+CEXTHS=1" is set, the unsolicited event code
(indicating whether the headset has been attached/detached) will be
sent to the terminal.
6.2.50 AT+SVR Configure Voice Coding Type for Voice Calls
AT+SVR Configure Voice Coding Type for Voice Calls
Response
+SVR: (list of supported <voice_rate_coding>s)
OK
Test Command
AT+SVR=?
Parameter
See Write Command
Response
+SVR: <voice_rate_coding>
OK
Read Command
AT+SVR?
Parameter
See Write Command
Response
OK
If error is related to ME functionality:
+CME ERROR: <error>
Write Command
AT+SVR=<voice
_rate_coding>
Parameter
<voice_rate_coding> A number parameter which indicate the voice
coding type.
0:FR
1:EFR / FR
2.FR / HR
3:FR / HR
4:HR /EFR
5:EFR/ HR
6:AMR-FR/EFR,AMR-HR
7:AMR-FR/EFR,AMR-HR/HR
8:AMR-HR/ HR/AMR-FR/EFR
9:AMR-HR/AMR-FR/EFR
10:AMR-HR/AMR-FR/FR
11:AMR-HR/HR/AMR-FR
12:AMR-FR/AMR-HR
13:AMR-FR/FR/AMR-HR
14:AMR-FR/FR/AMR-HR/HR
15:AMR-FR/EFR/FR/AMR-HR/HR
16:AMR-HR/ AMR-FR /EFR/FR/HR (default value)