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If you stray away from the company brand, your audience will notice and your on hold message will backfire. People will feel tricked as they wait to talk to an actual person, and by the time they reach someone real, they’ll be furious.

A typical Message on Hold program is 4 minutes long. Because a voice over talent typically reads between 100 and 112 words per minute, the script for a four-minute program can be up to 400 words, allowing for four to six paragraphs or messages, interspersed by brief intervals of music. Longer audio storage and program lengths are available if necessary.
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.