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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.

It's the only song Alex Cornell has ever written. Cornell was one of the co-founders of UberConference, and in addition to being a designer, is a singer and guitar player who had always found songwriting frustrating. "Then I just came to it one day," he says. "I just wanted to write a pleasant melody designed to be heard over the phone." With encouragement from Walker, Cornell started messing around with the lyrics. He wrote and recorded it in one night, in 2012, as a voice note on his phone — and thus, this self-aware hold song was born, and lives on, seven years later.
On-Hold Messaging has proven benefits when it comes to phone call retention rates and in helping to upsell new products and services. Fewer Hangups Giving your callers something informative or entertaining to listen to keeps them on the line and avoids the dreaded hangs ups - which may result in the loss of a sale.