We recently used Messages On Hold for our new telephone system and they were professional and super helpful. Very easy process and a pleasure to deal with. Voice overs came back professional, great sound quality and exactly what we requested. Highly recommend their services. 11 months ago
Maven engages Jonny Jingles for every production as his audio engineering and composing is exceptional. I cannot recommend him highly enough.

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.
Even if you’re business is not getting a high volume of inbound calls, if you transfer ANY calls or ever put customers on hold, even for just 10-15 seconds. Always use that time to give the customer another reason to think positively about your business.