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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.

Before we get into “Step-By-Step Guide to Custom On Hold Messages” it’s important to understand the value of having custom on hold messages for your brand. Business has always been done over the phone, and callers have always been put on hold, but as online shopping has surpassed brick and mortar traffic, over-the-phone sales have reached all time highs. A recent study by Marchex shows that Americans spent more than $1 trillion in mobile “click-to-call” commerce, and there was over 93 billion consumer-to-business phone calls from smartphones and this number is expected to grow to a whopping 162 billion by 2019, 70% of callers are placed on hold 62% of callers hang-up in less than 45 seconds 34% of callers who hang-up will never call back.
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