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Quectel EC25 User Manual

Quectel EC25
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LTE Module Series
EC25&EC21 AT Commands Manual
EC25&EC21_AT_Commands_Manual 190 / 231
Parameter
This parameter will not be saved.
12.4. AT+VTS DTMF and Tone Generation
The command is used to send ASCII characters which cause MSC to transmit DTMF tones to a remote
subscriber. It can only be operated in voice call.
OK
Read Command
AT+QAUDLOOP?
Response
+QAUDLOOP: <enable>
OK
Write Command
AT+QAUDLOOP=<enable>
Response
OK
ERROR
Maximum Response Time
300ms
<enable> Numeric type. To enable or disable audio loop test
0 Disable audio loop test
1 Enable audio loop test
AT+VTS DTMF and Tone Generation
Test Command
AT+VTS=?
Response
+VTS: (0-9,A-D,*,#),(0-255)
OK
Write Command
AT+VTS=<dtmfstring>[,<duration>]
Response
OK
ERROR
If there is any error related to ME functionality:
+CME ERROR: <err>
Maximum Response Time
Depends on the length of <dtmfstring> and <duration>.
NOTE

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Quectel EC25 Specifications

General IconGeneral
CategoryLTE Module
LTE TDDB38/B40/B41
WCDMAB1/B5/B8
GSM850/900/1800/1900 MHz
Data ratesLTE Cat 4: 150 Mbps DL/50 Mbps UL
GNSSGPS/GLONASS/BeiDou/Galileo/QZSS
Operating Temperature-40°C to +85°C
Form FactorLCC
Storage Temperature-45°C to +90°C
SIM Interface1.8V/3.0V
Antenna InterfaceMain, Diversity, GNSS
LTE FDDB1/B3/B5/B7/B8/B20
InterfacesUSB 2.0, UART, PCM, GPIO
Operating Voltage3.3V - 4.3V
ProtocolsTCP/IP, UDP, FTP, HTTP, HTTPS
CertificationsCE, FCC, PTCRB, GCF, RCM, IC

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