Before you start, check with your IT support team or phone system vendor to see if there are any special requirements you need to be aware of. Things like: How long can the recording be? What type of audio file does it need to be? Is there a maximum file size?
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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.
“The on hold messaging for Discount Parts Exchange has a great mix of humor and relevant information. The voice talent is excellent and seems to be a great fit for their target audience.” - Mike Kurtz / On Hold Messaging Association's MARCE Awards Judge