Open atulgo opened 4 years ago
@atulgo
Hiii,
I tried to do the same what you written.
I send command to GSM like this AT+DDET=1,100,1,1\r\n
over UART
I was getting ERROR when I have not inserted SIM in GSM. But after inserting SIM I send the same command and got OK
response.
Then I dialed call and when opposite party picked the call and press the numbers from keypad of mobile phone, What response I got shown below.
+DTMF: 1,40
+DTMF: 2,100
+DTMF: 3,120
+DTMF: 6,140
+DTMF: 7,340
+DTMF: 8,360
+DTMF: 9,380
+DTMF: *,200
+DTMF: 0,140
+DTMF: #,300
+DTMF: 1,340
The first data shows the digit/character pressed from the mobile phone on call with GSM, and second data shows how long time that character was pressed.
I hope this information will solve your problem
Will try to replicate ur steps today. Thanks a lot.:)
I have a question my phone doesn't receive DTMF tones while the call (can't be heard) should SIM800L or DTMF decoder module work with it?
@Mamdouh-Freelancer
Yes, you will get DTMF data in SIM800L. Could you please tell me in detail, what testing you have made so I can guide you properly.
@Mamdouh-Freelancer
Yes, you will get DTMF data in SIM800L. Could you please tell me in detail, what testing you have made so I can guide you properly.
Thanks for your response, Below is what I tried with normal phone call using old/smart phones:
After long googling times I found that phone companies may put all the signaling on a different channel not through voice channel. I wish if DTMF decoder can decodes too (as same as SIM800L) incoming signals through that different channel? Is this forbidden only in my country's mobile operators so?
I tried this project DTMF Decoder Using Only Arduino © GPL3+ DTMF decoder without an 8870). But it doesn't work properly as serial monitor is printing out even no sounds and never prints the right digits pressed. I hope anyone can clarify more about the diagram (for electronic beginners like me) and connection, specially capacitor position If it needs a new post I will post ASAP.
Esse módulo não serve para nada as operadoras de telefonia bloqueiam Sim800l
Not in the UK - GPRS is still going. However it is set for sunsetting at some point in the future.
On Fri, Jun 30, 2023 at 9:33 AM Rogerjoumblat @.***> wrote:
Esse módulo não serve para nada as operadoras de telefonia bloqueiam Sim800l
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@Mamdouh-Freelancer Hello mamdouh i hope you are doing well. I am facing the same problem with the sim800l's DTMF tones, Kindly i wish to know what did you come up with after about two years
Detection of DTMF tones in my SIM800L module.
I get "OK" when I send 'AT+DDET=1,1000,1,1* ' over uart . But it doesnt seem to detect anything afterwards. Perhaps I am doing something wrong. Would be great to get some feedback.
regards Atul ref : *SIM800 Series_AT Command Manual_V1.09