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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.

10. Max Wait Time Reached Message. What the caller hears when they have been waiting in the queue for the maximum amount of time. Sample Scripts: “You have exceeded the waiting limit for this queue.
Regrettably for my purpose, the software requires that you add a "message on hold", which makes perfect sense for this devices intended purpose, if not for my own use. But I worked around the problem by recording a second of silence and then adjusted the software the effectively play only my cheesy elevator music.