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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.

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IOS Swift WebRtc insertDtmf issue

I am building an app that works with janus gateway via websocket and webrtc. everything works fine, I can send and receive voice calls successfully but insertDtmf metod doesnt send my dtmf to other peer. Same account and same codes in android works…
Bilal Şimşek
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Making incoming call to Twilio number, I hear message from SAY verb but not tones of digits from PLAY

Using the below code in a TWIML Bin, when I call my Twilio number I hear both SAY messages properly but just silence when I'd expect to hear the tone for [wait 1 second] 3 [wait 1 second] 3 [wait 1 second] 3 [wait 1 second] 3. Any idea what I'm…
user1925612
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Playing DTMF tones into a call

We're trying to determine a way to send DTMF into the call. As we understand, It's only possible by using this Vonage API -> https://developer.nexmo.com/api/voice?theme=dark#play-dtmf. But initiating a call using TokBox API ->…
Andrii Horda
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How to Send DTMF in iOS4

Is it possible to send dtmf from iPhone application in background state after connecting the call? I don't want to use pause and wait. I tried to find from CoreTelephony.framework but didn't find anything like this.
John
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Is it possible to pass DTMF tones to Twilio Video room participant?

We have a video room participant which we need pass DTMF to. We are adding him to video room as described here: https://www.twilio.com/docs/video/adding-programmable-voice-participants-video-rooms. Then we use custom dtmf tone javascript generator…
Pavel Savrovsky
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DTMF detection from a wav file

I'm an engineering student and I have to solve an academic problem regarding signal processing. Basically, given an DTMF signal in wav format, I have to identify the number sequence it has encoded. I must do so using discrete fourier transform…
Joum
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Decode DTMF from a wav file with FFT

I need to detect the keys pressed in the wav file using the FFT. But I'm completely stuck with it, just don't know what to do. I have read that you can detect the tones with the help of Goertzel algorythm, but, again, I haven't found nor explanation…
Musorski Pavel
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Android SIP DTMF

I have set up my asterisk sip server in such a way where I would transfer a call by first dialling "*2",then the server would prompt me asking for the number to which I want to transfer the call and then I could dial the number. I want to make a…
pranav harish
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Not able to send or trace Dtmf from Android Device to sever using Andriod native sipstack?

I have implemented a simple sip call in Android App using Andriod native sipstack SipManager. But not able to send a dtmf signal. Its not received at server side and do not get any error as well. Not able to trace what are error . i am technically…
Tim
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How can i detect sound frequency on Java

I need to read the audio streaming and determine generated ultrasounds How can I find a certain sequence of sounds from streaming audio? At first I thought in the direction of DTMF, but then rejected it because it is the human ear hears. If you have…
MoTaKuJi
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iOS - VialerSIP - Send DTMF via Inband

I'm using VialerSIP for my iOS VOIP app. I'm trying to send DTMF via inband instead of the method: - (BOOL)sendDTMF:(NSString * _Nonnull)character error:(NSError * _Nullable * _Nullable)error; in VSLCall class. Because, it seems some of countries…
J.K Jeon
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SDP Offer/Answer model with DTMF rtpmap/fmtp mismatch

Imagine an offer SDP that has one line of "m" with codecs 8 and 101 for DMTF and marked as sendrecv: m = audio 35904 RTP/AVP 8 101 a = rtpmap:8 PCMA/8000 a = rtpmap:101 telephone-event/8000 a = fmtp:101 0-15 a = sendrecv The offered SDP is answered…
takobaba
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tfidf vectorizer process shows error

I am working on non-Engish corpus analysis but facing several problems. One of those problems is tfidf_vectorizer. After importing concerned liberaries, I processed following code to get results contents = [open("D:\test.txt",…
user103987
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Generating DTMF tone to send in RTP packet

I have the following code to send as audio RTP packet some DTMF digits: int count=0 for(int j = 0; j < samples; j++) { waves = 0; // dtmf tone 1 waves += sin( ((PI * 2.0f / 8000) * 697.0f) * count ); waves += sin( ((PI…
tech74
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Create repeating dtmf tone to play with AVAudioPlayer

HI, i'm trying to create a repeating dtmf tone so i can play it with AVAudioPlayer. Currently when i loop it in some audio editing software such as audacity there is always a glitch or change in tone at the point where it repeats. Is there some…
tech74
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