Maven engages Jonny Jingles for every production as his audio engineering and composing is exceptional. I cannot recommend him highly enough.
The Business Audio System features a high quality metal enclosure and electronics for the demanding business environment.

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 term “ring” has long been an anachronism, as there haven’t been actual bells on phones for decades. The first ringback tones were created in Finland in 1998, when the Finnish mobile operator Radiolinja began offering the service of hearing customized monophonic ringtones and ringback tones that were sent over the air. Ringback tones, for whatever reason, never really caught on in America the way they did internationally.