Download Dtmf Tones As .wav Files
Evelina Kealohanui
This recording file was originally a .wav file which we converted with the following sox command:
sox /nfs/newadmin/public/users/crs/testbuddy/dtmf/newzip/01.wav -t raw -r 8000 -s -2 -c 1 /nfs/newadmin/public/users/crs/testbuddy/log/ast87_ao1/01.sln
Our testing includes validation of routing and reception of audio prompt files. Our mechanism, used by others, has been to create a testing set of our prompts with embedded identifying DTMF tones, e.g 100 for prompt number 100. Our software then verifies the prompt received by recognizing the embeded DTMF. This has worked reasonably in the past. To handle some of the DTMF recognition problem we add redundancy to the embedded codes. To recognize possible clipping of the prompt signal we include a copy of the embedded identifying code at the beginning and end of the prompt wave form.
Lennie has 16 .wav files numbered 01 through 16, every time you iterate, you wait for audio and then increment i to then play the next audio file in sequence after waiting for audio, if the far end says anything it continues to the next iteration (talk) if not the channel is hungup. when you hit the limit at 16 you reset i to 7.
I want to create a custom element that sends DTMF according to my logic . I can file play .wav files of dtmf tones but there is a better solution i believe. How can i use VXML feature below to create an element for on call studio. Can you share a document or code block on how to do it?
I found an online tool and also a Github project that were able to accurately decode DTMF tones from an audio file, however, these tools only support .wav files so I started by converting the .mp3 into .wav with ffmpeg.
dedtmf is a Matlab script that attempts to suppress stationary tones an audio file, while leaving more dynamic components unchanged. This could be useful, for instance, to suppress DTMF tones mixed in with speech.
Using the [Extract Files]( =Extract_Files(true,true,true,true,true,true,false,true)) function of [CyberChef]( ), I found that a [WAV file]( -writeups/raw/main/bsidessf-22/dual-type-multi-format/extracted_at_0x3c02) containing dial tones was hidden inside of [hello.webp]( -writeups/raw/main/bsidessf-22/dual-type-multi-format/hello.webp). I'd encountered these kinds of tones before in past challenges, and had found that I had the most luck with a site called [dtmf-detect]( -detect/). Running the file through the tool found here decodes the tones into `435446764696165#665#666#725#66661677`.
This table shows graphically the layout of the keys on the DTMF keyboard withthe corresponding frequencies and the minimum and maximum values for eachtone. Wave files containing the corresponding tones for each key can also bedirectly downloaded.
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