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.
Once your script is cleared and your voice and music chosen, we’ll record your on hold message with the voiceover, ensuring they have just the right tone and style for your business.

Recording services can provide a dramatic improvement to your company image by offering your callers on hold messages that convey important facts about your business, including operating hours and featured products. Using on hold messages gives businesses in right throughout Australia a valuable opportunity to communicate with clients and has the added benefit of reducing dropped call rates.
And if you write something that doesn’t impress your coworkers or earn accolades, that’s fine. It’s called the writing process, and it’s why most writers prefer their seclusion. All writers are embarrassed by their first drafts.