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Questions tagged [dtmf]

Related to transmitting or receiving Dual-Tone Multi-Frequency (DTMF) signaling, a technology used in analog telephony.

Related to transmitting or receiving Dual-Tone Multi-Frequency (DTMF) signaling, a technology used in analog telephony.

217 questions
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How can I originate a call and read DTMF value using asterisk-java?

I'm developing a java application that should be able to call another party using Java-Asterisk and get a DTMF value from user. I am using originate command of AMI and I'm stuck. I can call the other party but the call is ended immediately after…
hkazemi
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Custom dial pad DTMF tones are too loud

I've a requirement of developing dial pad in my app, same like native iPhone phone application dial pad. I've added .wav files to my project for playing sound when clicked on the number buttons but they are too loud. But iPhone phone application…
CSK
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Code to read data from microphone and detect DTMF tones

All I need is a peice of java code that can detect DTMF from microphone print out the characters to System.out. I've been searching forever and I couldn't find it.
Henry
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Detect DTMF Dial Tone Using Java - J2SE

I am trying to do the following I am getting a call to another person using my java application (Already done & works fine). Then I am playing a recording, for example "Please press 1 one to continue in english" (Already done & works fine). Now I…
Rakitha Fernando
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is pjsip_endpt_handle_events necessary for pjsip timer

i'm using pjsip 2.01 in debian linux. i'm writing small class to allow my program make calls to specific phones and play wav files. i already did that and everything works fine. but now i want to play DTMF signals inside the call. i want to use…
Demo_S
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Windows Phone Phonecall with dtmf

I know using phonecalltask we can make a call programmetically by filling the phonenumber field . A sample code may be PhoneCallTask phn = new PhoneCallTask(); phn.PhoneNumber = "9807689,657"; phn.show (); But my question is,is it possible to…
Shofiqul Alam
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Sending # as dtmf in android

I'm trying to make a call directly like this String url = "tel:" +"029870125,198#"; Intent intent = new Intent(Intent.ACTION_CALL,Uri.parse(url)); but the problem is that Android is sending 198 as dtmf, but the # is…
Shofiqul Alam
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How to stream DTMF tones through my HEADPHONES?

kind of new to android. I have an app up and running, I am producing DTMF signals and interpreting what is generated with a micro controller. I am successfully generating the tones, but the tones are being played through the speaker and I want to…
Armon-LUStudent
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DTMF Goertzel Algorithm Not Working

So I am opening a .raw file of a DTMF tone I generated in audacity. I grabbed a canned goertzel algorithm similar to the one on the wikipedia article. It doesn't seem to decode the correct numbers though. The decoded number also changes depending on…
BlackCow
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How to speed up iPhone DTMF signal dialing

I am creating a dialing mobile app for iPhone using NSUrl function. The calling number consists of two parts - GSM service number and DTMF tones. For example, 810011111,46144443 . Is it any possibility to make DTMF tones be dialed in similar way as…
Jonas Valancius
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DTMF Tone Android

I have searched lot about DTMF Detection in android. But android dose not provide inbuilt API for DTMF detection. Dose anyone has idea about third party API that provide DTMF Detection facility. DTMF detection Algorithm can also suggest if you know.
user861973
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Automate Ivr call by providing dtmf input programatically

I am planning to automate the telephone balance enquiry system. I am planning to build an App that takes card details from user and automatically dial in to a telephone balance enquiry system get the balance and update the balance every day. Can any…
Durga prasad
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Must the "telephone-event" have the same frequency as the codec used in the call?

I use RFC2833 as the DTMF transmitting method for the calls. Q1: Must the "telephone-event" have the same frequency as the codec used in the call? E.g. If I use SPEEX 16000 then can I have telephone-event/8000? Q2: And can I have SDP without any…
Oleksii
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DSP and ML: How to classify DTMF tones?

I am currently learning ML and one project (for learning purpose) that I am thinking is to classify DTMF tones using ML. I will be using numpy/scipy and I will have a time domain DTMF signal (for all the numbers 0-9) and use that on an FFT function…
newbie programmerz
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Is ToneGenerator sound smooth?

Does anyone have the same problem? On Android's Phone app, whenever a number is pressed, the tone is always smooth. But, when I used very similar code as the Phone app, the tone I get regularly isn't smooth...there are gaps. Is there a way to…
mmmmm5
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