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Chapter 15 – Audio Commands
92 Multi-Tech Systems, Inc. CDMA C1 AT Commands Reference Guide
Echo Cancellation +ECHO
Description: This command is used to enable, disable or configure the Echo Cancellation functions for voice
calls (in rooms, in cars, etc.). The +SPEAKER function automatically sets echo cancellation based
upon audio path choice and this command allows non-standard operation.
Syntax: AT+ECHO= <mode>
Command
Possible Responses
AT+ECHO?
Note: Read current settings
+ECHO: 0
OK
AT+ECHO=0
Note: Set Echo Cancellation Off
OK
AT+ECHO=1
Note: Set Echo Cancellation to Ear Seal
OK
AT+ECHO=2
Note: Set Echo Cancellation to Headset
OK
AT+ECHO=4
Note: Set Echo Cancellation to Handset
OK
AT+ECHO=5
Note: Set Echo Cancellation to Default Path
OK
AT+ECHO
OK
Note Set to 5 (default)
AT+ECHO=?
Note: Test command
+ECHO: (0-5)
OK
Note: Possible values
Values: <mode>
0 Vocoder Echo Cancellation Off
1 Ear Seal Echo Cancellation (default for Analog 1 path)
2 Head Set Echo Cancellation
3 Acoustic Echo Cancellation (AEC)
4 Speaker Echo Cancellation for car kit operation
5 Default Echo Cancellation for current path settings (default)
If no argument is supplied to the command, the default value is assumed. The configuration is
saved immediately. See the Audio Overview section for more information.
Loudspeaker Volume Level +CLVL
Description: This command sets the loudspeaker volume level of the audio path.
Syntax: AT+CLVL=<Level>
Command
Possible Responses
AT+CLVL
OK
Note: Sets default value of 9
AT+CLVL=2
OK
Note: Command valid
AT+CLVL?
Note: Interrogate value
+CLVL: 2
OK
Note: Current value
AT+CLVL=?
Note: Test command
+CLVL: (0-12)
OK
Note: Possible values
- CDMA-C1 AT Commands 1
- Copyright 2
- Trademarks 2
- Revisions 2
- Contacting Multi-Tech 2
- Contents 3
- Contents 4
- Document Scope 9
- Related References 9
- Serial Interface Settings 10
- Overview 10
- Terminology 11
- Command Format and Syntax 11
- Command-Line Editing 12
- Input Command Syntax 12
- Other Syntax 12
- Output Response Syntax 12
- Parameter Defaults 13
- Unsolicited Message Syntax 13
- Attention AT 14
- Repeat Last Command A/ 14
- Echo E 14
- +WUSLMSK 15
- Syntax: AT+WPRI? 16
- Hardware Version +WHWV 17
- Capabilities List +GCAP 19
- Subscriber Number +CNUM 19
- Save Configuration &W 21
- General Indicator +WIND 22
- Result 23
- Examples: +WIND: 4 23
- Error Codes: 24
- Chapter 7 – Status Commands 25
- Fixed DTE Rate +IPR 28
- Set DCD Signal &C 29
- Set DTR Signal &D 29
- Set DSR Signal &S 30
- Syntax: AT+DR=<val> 31
- Syntax: AT+WCHD 31
- Automatic Answer S0 32
- Command Edit Character S5 33
- Dial Command D 35
- Hang-Up Command H 36
- Answer a Call A 36
- Syntax: ATA 37
- Incoming Call +RING 38
- Emergency Mode +WSOS 40
- Call Answered +WANS 41
- Call Connected +WCNT 41
- Call Ended +WEND 42
- Call Originated +WORG 43
- CPHS Command +CPHS 43
- Values: <LineId> 44
- Examples: 44
- Call Forwarding +CCFC 45
- Syntax: AT+WFSH 46
- Unsolicited 46
- Send DTMF Tones +VTS 47
- Serving System +CSS 49
- Signal Quality +CSQ 50
- Band Preference +WBND 53
- Service Indication +WSRV 53
- Roam Preference +WRMP 54
- Default Cell Band +WDCB 55
- Roaming Indication +WROM 55
- Values: <indicator> 56
- Values: <mode> 58
- Excess SPC Failures +WLCK 60
- Commit Changes +WCMT 61
- Set IMSI +WIMI 62
- SID and NID +WSID 63
- Commit Successful +WOTC 66
- SPL Unlocked +WOTS 66
- NAM Download OK +WOTN 66
- MDM Download OK +WOTM 67
- IMSI Download OK +WOTI 67
- PRL Download OK +WOTP 67
- Values: <Mode> 74
- Parameter 74
- Send Message +CMGS 75
- Read Message +CMGR 76
- List Message +CMGL 77
- Delete Message +CMGD 79
- Syntax: +WMGF 84
- Audio Subsystem Overview 85
- Chapter 15 – Audio Commands 86
- Microphone Gain +VGT 87
- Speaker Gain Control +VGR 88
- Values: <Gain> 89
- Digital Gain Receive +WDGR 90
- Values: <val1> 91
- Echo Cancellation +ECHO 92
- Audio Loopback &T 94
- Quick Net Connect $QCQNC 95
- R-SCH Selection $QCMIP 96
- MIP Selection $QCMIPP 96
- Chapter 16 – Data Commands 97
- Configure TCP/IP +WIPCFG 99
- Values: <cmdtype> 101
- Bearer Status +WIPBR 102
- Values: <protocol> 103
- Response 105
- Syntax: AT+WIPERR? 105
- Values: 107
- Options and 107
- 32kHz Sleep Mode +W32K 110
- Chapter 18 – Sleep Commands 111
- Syntax: +WNETTIMEGET? 112
- Response Field 112
- Description: 112
- Introduction 113
- Acquiring Cellular Service 113
- Call Processing 114
- Sending Binary Data 115
- TCP Socket Examples 116
- TCP Client Socket Connection 117
- TCP Server Example 117
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