It 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 o

It 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.