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DTMF issues and problems when using VoIP.
https://www.voipmechanic.com/dtmf-issues.htm
The switch has to detect and remove the tone sent by the ATA from the audio stream because the upstream provider specified RFC2833 DTMF. At times the switch can't always completely remove the in-band DTMF tone which is a problem, because by the time it has detected the DTMF tone, it has already passed a short amount of it.
Remove residual DTMF in audio stream | Netgate Forum
https://forum.netgate.com/topic/19798/remove-residual-dtmf-in-audio-stream
The application servers are running Dialogic drivers which are picking up some of the residual audio and duplicating DTMF. There does not appear to be a way of setting a minimum DTMF duration in Dialogic to drop these short tones. Is there a way to configure Freeswitch in pfSense to remove these residual tones from the audio stream while bridged?
Doubled DTMF in audio stream and RFC2833 from S4B
https://social.technet.microsoft.com/Forums/en-US/6286a11b-8cb6-4cb8-a643-9c4aeb80d546/doubled-dtmf-in-audio-stream-and-rfc2833-from-s4b
Hi, I'm having a strange issue with DTMF on one of the sites. On the call from S4B to PSTN over mediant 1000 the Mediant 1000 receives DTMF tones both in audio stream as audio tones and in separate rfc2833 RTP stream simultaneously. As a result the DTMF digits are doubled on the PSTN side. I tried different setting on mediant to filter DTMF ...
c# - Decoding DTMF from a WAV file - Stack Overflow
https://stackoverflow.com/questions/34092954/decoding-dtmf-from-a-wav-file
CalculateGoertzel () returns the power of the selected frequency within the provided sample. Calculate this power for each of the DTMF frequencies (697, 770, 852, 941, 1209, 1336, and 1477 Hz), sort the resulting powers and pick the highest two. If both are above a certain threshold then a DTMF tone has been detected.
DTMF Audio Adjustments for Transmitters - Genave
http://genave.com/dtmf-audio-adjustments/
First, you can simply adjust the deviation of the radio to a lower level. Secondly, you can lower the DTMF audio input to the radio. Lower audio in is just like speaking further from a microphone. It is less loud, and is less likely to exceed the maximum channel output. The DTMF “2/3” Rule of …
RTP Payload for DTMF Digits, Telephony Tones and …
https://www.cs.columbia.edu/~hgs/rtp//drafts/draft-ietf-avt-rfc2833bis-02.pdf
This memo describes how to carry dual-tone multifrequency (DTMF) signaling, other tone signals ... the gateway needs to remove the in-band signaling information from the bit stream. It can now either carry it out-of-band in a signaling transport mechanism yet to be defined, or it can use ... audio signal on the B-channel or can use the Q.931 ...
DTMF interworking between Inband G711 & RFC2833 & out of ...
https://community.cisco.com/t5/ip-telephony-and-phones/dtmf-interworking-between-inband-g711-amp-rfc2833-amp-out-of/td-p/3357598
3- Some rare people are dialing in to the Call Center number and sending inband audio G.711 DTMF (so inband DTMF with no DTMF information in the payload) ---------Calls described in point #3 fail. Taking packet capture on the CUBE I can confirm using Wireshark that calls coming in using with RFC 2833 compliant DTMFs are handled properly by the ...
DTMF Tones and Signaling Explained - OnSIP
https://www.onsip.com/voip-resources/voip-fundamentals/dtmf-tones-and-signaling-explained
DTMF works by assigning eight different audio frequencies to the rows and columns of the keypad. The columns on the keypad are assigned high-frequency signals, while the rows are assigned low-frequency signals. When you press a key—which corresponds to a number or symbol—the phone generates a tone that simultaneously combines the high ...
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