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.
The VTech 4-Line Small Business System Main Console (CM18445), works with the Easy On Hold® 2 Channel Business Audio System, allowing streaming music and messages on hold that sound just like a major call center. This VTech phone has a place to plug in our message on hold player device, so callers will hear your messages while they wait on hold.

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* * A voice over script must accompany every order. The music is not available alone.