This strict synchronization and performance licensing ensures all parties are legally protected.
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.

For the best results, we recommend a studio recording of your representative’s voice. If needed, we can also arrange remote voice recording via telephone or smartphone app. Most often, a “special message from the CEO/President” will be a component of an on hold program, with the remaining messages recorded by one of our professional voice talents. This maintains a “spokesperson” approach and creates a distinction between standard content and the CEO’s announcement.
No monthly fees. Perfect for customers that do not want to update the programs on a regular basis. A state-of-the-art, fully digital on-hold device Professional male and female voice talent Extensive selection of background music Broadcast quality studio recordings Professional script writing Music licensing fees Solutions On Hold utilizes the highest quality digital playback equipment available in the market today.