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https://community.cisco.com/t5/collaboration-voice-and-video/dtmf-digits-from-pstn-callers-are-not-recognized-in-the-greeting/ta-p/3133161
Technology and Support: Collaboration, Voice and Video: Collaboration, Voice and Video Documents ... Calls from the IP phones within the network have no issues when the Dual Tone Multifrequency (DTMF) inputs are entered. The PTSN calls are routed properly, but Cisco Unity shows incorrect digits that are received compared to the digits the ...
https://electronics.stackexchange.com/questions/196417/how-to-initiate-a-call-on-a-gsm-module-from-dtmf-tones
Today 30 some years later, the same command is being used to dial voice calls with cellular modems. For example, ATDT8005551234. would call the number (800) 555-1234. If the far end answers, the GSM modem answers: CONNECT. So the cell modem does not send the number to the cell tower as DTMF tones. Instead it is part of a data stream.
http://www.voicevisionivr.com/blog/what-is-dtmf
Over regular phone lines, DTMF is sent as audio. VoIP phones are designed to carry voice only, but can send DTMF as a data packet over the internet. This data packet contains a close match to the DTMF but not an exact representation. Sending DTMF over VoIP may create either a duplicated digit or no digit at all on the receiving end.
https://community.cisco.com/t5/collaboration-voice-and-video/understanding-sip-dtmf-options-supported-by-cucm/ba-p/3107307
Technology and Support: Collaboration, Voice and Video: Collaboration, Voice and Video Blogs: ... If MTP is required due to Asymmetric DTMF relay support, MTP will be invoked by CCM and OOB input will be injected to RTP by CCM via SCCP. ... CUCM will pick the DTMF method to negotiate DTMF, so an MTP is not required for the call. If Cisco ...
https://en.wikipedia.org/wiki/Dual-tone_multi-frequency_signaling
Dual-tone multi-frequency signaling (DTMF) is a telecommunication signaling system using the voice-frequency band over telephone lines between telephone equipment and other communications devices and switching centers. DTMF was first developed in the Bell System in the United States, and became known under the trademark Touch-Tone for use in push-button telephones supplied to telephone ...
https://stackoverflow.com/questions/6342236/sending-dtmf-tones-over-the-uplink-in-call
Hence, I'm afraid this is not possible at the moment. There's an open feature request on Android for sending DTMF tones over an existing phone call, but it has been dormant there for almost two years. I understand that this doesn't resolve your problem, but take note that you can send DTMF tones directly after dialing a number:
http://www.gsm-modem.de/dtmf-audio-codec.html
DTMF tines generated by separated source. The DTMF signal is generated by a separated source, typically a landline (corded) phone, and sent to the input lines of the module (Uplink path). The frequencies couples, sent on the voice channel, are digitised, encoded and sent by the digital transmission system.
https://www.voipmechanic.com/dtmf-issues.htm
Troubleshooting DTMF problems with your VoIP connection. Troubleshooting DTMF issues are hit and miss and may be as simple as using a different DTMF setting and retrying. But, before making any changes with settings make sure that the issues that you are experiencing are not related to packet loss.
https://searchnetworking.techtarget.com/definition/DTMF
Sep 01, 2005 · DTMF (dual tone multi frequency) is the signal to the phone company that you generate when you press an ordinary telephone's touch keys. In the United States and ...
https://en.wikipedia.org/wiki/ISDN
Integrated Services Digital Network (ISDN) is a set of communication standards for simultaneous digital transmission of voice, video, data, and other network services over the traditional circuits of the public switched telephone network.It was first defined in 1988 in the CCITT red book. Prior to ISDN, the telephone system was viewed as a way to transport voice, with some special services ...
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