Did you know that well-designed on-hold messages with pleasant, enjoyable, smiling narration, have the power to make your callers feel more confident about retaining your services? It also increases their trust in your company. It's tricky, but the reverse is really true. An unpleasant delay provides your callers with a great opportunity to judge your facilities and customer service.
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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.
Power loss? No problem. The GDI-USBM10 automatically starts playing after power is restored.