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well yeah, as OG mentioned he'd hear the tones "if picked up hast enough" - probably would miss almost all of it unless you have superhuman reflexes and the exchange links the connections fast enough. (i.e. those tones would be sent during the ringing time)
same as if you dial someone and while talking to them start pressing the number buttons - you hear the button tones. (think helplines: "press '1' for English, '2' for Chinese ... '9' for go away")
but even helplines would miss the first numbers if appended to the dialed phone number (before pressing call) ...the exchange end-to-end connection completion on receiving party pickup takes a while, even the new exchanges there's still some milliseconds in there.
International dialling uses more than the 10 digits used in the US. For example, to dial an international number, I have to dial an international access code (2-3 digits), the country code (1-3 digits), an the national number (7-10 digits), for a total of 10-16 digits.
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