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Would recording a DTMF tone as your voicemail greeting get around the "press any key to get your code" prompt?
by crb 12y ago
Would recording a DTMF tone as your voicemail greeting get around the "press any key to get your code" prompt?
- quasque 12y agoIt would be interesting to see if the DTMF tone could be recorded, or if the voicemail system would capture it first and abort the recording. Maybe it depends on which tone is played? Investigating the extra A, B, C and D DTMF tones may be of use in this scenario, just in case voicemail systems don't recognise them as commands but 2FA callbacks allow them for confirmation.
- jpollock 12y agoIt depends on the quality of the codec used by the VM system. Any compression is likely to destroy the code. VoIP protocols usually send DTMF as specific messages for this reason. However I wouldn't be surprised if it worked.
- hetman 12y agoSending tones in band actually works reasonably well on mobile networks. It's not 100% reliable which is why alternate signaling is used, especially when the signal quality is low.
- kolev 12y agoPeople don't tend to read comments - I asked about this same thing below, but, for example, PhoneFactor, uses the #, which is often used to end recording, so, "any key" is dangerous, # is not as much.