3 defined values, 17 audio loop test +tloop, 1 description – Rainbow Electronics 900 User Manual
Page 39: 2 syntax, 17 audio, Loop, Test +tloop

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AT+CRSL=15
Note : Set volume to Max.
OK
Note : Current ring playing with Max.
volume.
AT+CRSL=?
Note : supported parameters
+CRSL: (0-15)
OK
5.16.3 Defined
values
:
0 Min volume
6 Default volume (default)
15 Max volume
5.17 Audio loop test +TLOOP
5.17.1 Description:
This specific command is used to open MAINMIC/AUXMIC and RECEIVER/EARPHONE for
audio loop test
5.17.2 Syntax:
Command syntax: AT+TLOOP=m,
Command
Possible responses
AT+ TLOOP =1,0
Note: test main micro and receiver
OK
Note: Command valid
AT+ TLOOP =1,1
Note : test aux micro and earphone
OK
Note: Command valid
AT+TLOOP = 0
Note: close audio loop test
OK
Note: Command valid
AT+ TLOOP?
+CME ERROR: 3
Note: not support this command
AT+ TLOOP =?
+ TLOOP: (0~1), (0~2)
OK
5.17.3 Defined
values:
m:
0 close
audio
test
1 open
audio
test.
device:
0
main micro and receiver.