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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.

Note that the music will always play from the beginning each time the unit is turned on. This isn't a problem when using the device for music on hold, it's intended purpose. But for my use, I bought a bunch of 1 GB USB drives, and recorded different "cheesy elevator music" on each, which we will be able to change out for variety.
Note: if you have deleted the default music on hold and would like to restore it you may download the file from here. In the Upload audio file box, click Choose File to select a file from your computer, or type the location of the file.