"It's been this ridiculously great viral feature," said Walker. "The feedback I get from people is like, they'll sometimes even show up late to make the other guy listen to the hold music."
For those still using analogue or digital phone systems, voice on ISDN circuits has a bandwidth of around 4000Hz. The audio from an analogue phone is sampled at 8000Hz, and because of the nyquist theorem, must be low-pass filtered to 4000Hz. So any frequencies in the audio beyond 4000Hz are lost. Interestingly, the human ear and mind are good at recognising human speech, so this is considered "toll-quality" voice, i.e. good enough to pay for. This is the reason why certain vocalised letters are difficult or impossible to tell apart on the phone. For example, the differences between B, P, T, C, etc. are almost entirely above 4000Hz.

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You’ve heard the basic format for on hold messages before: “Thank you for holding. A representative will be with you shortly…” But there’s far more to an on hold message than the same robotic voice over and over.