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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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Sending DTMF tones over the uplink in-call

I'm working on a project that requires my app to be able to send DTMF tones on the voice's uplink frequency during an active call. My 2 conditions are: We don't use a customized Android platform We don't need to root the phone I've spent several…
Simon McCorkindale
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Can I setup IVR on my Android phone?

I think to make it possible I need to make the app automatically respond to the incoming calls. Is that possible at all? I want to build an android application for small business. Using this application a business owner can: setup a custom IVR…
user3471244
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What is AudioFlinger and why does it fail TONE_PROP_ACK?

In my application I issue the following statement: toneGenerator.startTone(ToneGenerator.TONE_PROP_ACK, 600); Which works very well on a cheap LG LS670 running Android 2.3.3 but doesn't sound at all on all other phones I have, ranging from Android…
Eternal Learner
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Decoding DTMF from a WAV file

Following on from my earlier question, my goal is to detect DTMF tones in a WAV file from C#. However, I'm really struggling to understand how this can be done. I understand the DTMF uses a combination of frequencies, and a Goertzel algorithm can be…
KenD
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Hide dtmf tone while dialing

I'm making a call app with call a number and send dtmf tone after that by String number = "tel:+1234567,890#"; Intent c1 = new Intent(android.content.Intent.ACTION_CALL, Uri.parse(number)); Currently it can dial 1234567, wait about 3 sec, then…
Hardy
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Show in-call dialpad - Dial a number during call - DTMF

I want to dial a number after I have answered a call, normally done by the in-call dialpad. I tried the following, but that starts dialing a new call instead (so does ACTION_VIEW). Intent dial = new…
MaXKilleR
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SIP CSeq for INFO and INVITE methods

Consider this sample SIP dialog A-->--INVITE-->--B CSeq 101 A--<--TRYING--<--B CSeq 101 A--<--200 OK--<--B CSeq 101 A-->-- ACK -->--B CSeq 101 A-->-- INFO -->--B CSeq 2 A--<-- 500 --<--B CSeq 2 ... While working on a…
Prince Singh
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Insert keypresses into the Linux console from Python

I have recently been faced with a rather odd task, one result being the necessity for the ability to use DTMF (aka "Touch Tone") tones to control a non-X Linux computer's terminal. The computer has a modem which can be accessed through ALSA, and…
mmirate
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How to use the DTMFRecognitionEngine class in Microsoft.Speech

The Microsoft.Speech SDK has a DTMFRecognitionEngine class, which I'd like to experiment with - we need to detect DTMF tones within a WAV file (I realise there are other ways to do this, but I'm evaluating all possible methods). The documentation…
KenD
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Can I send digits to an incoming twilio call with twiml?

I have a twilio number that can process incoming calls with twiml. These incoming calls expect the recipient to press some digits after the call is connected. If I were making an outgoing call, I could use the sendDigits attribute of a tag.…
hughes
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Play DTMF tones in outgoing call using Twilio

In my Twilio-based application I create outgoing calls via the Twilio REST API. When the target side responds, I put him/her to the recently-created conference. How can I play a certain set of DTMF tones before putting him/her to the conference? The…
Bogdan Burym
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Generate DTMF Tones

I am wondering if anyone has come across a way to generate tones in the iPhone SDK. I am trying to generate DTMF tones, and can't seem to find anything substantial out there. I want to be able to specify how long to play the tone for as well (i.e.…
Dutchie432
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Android APIs to Auto answer the call and read DTMF tones

I would like to know the following whether possible with Android or not. I keep searching on line but no luck. I feel that may be possible with new versions of the Android. I want check with experts on Stackoverflow. Shall I Auto answer the call…
user3431554
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How to play DTMF tones in android via headphone programatically?

I am currently working on a car security system.... I need to produce DTMF tones via the headphones of the phone that makes an input to the external digital circuit. Is there any API to do this? Canany one helpm.... Thanks in advance...
Jithin Kuriakose
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Receiving DTMF in Android

Wanted to know if there is a way to decode the DTMF signals (sent from other phones) into numbers so that the number can be manipulated as required? For eg: If I am pressing 1234 from phone A during a call I should be able to get that 1234 number on…
tejasvi
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