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.
Lastly, real-time status updates are a useful way to keep track of your messaging system. With marketing automation, they can be sent to a manager for better decision making. Web-based management portals allow you to see account details as well as past and present on hold productions. This way, you can track the status of a particular customer’s production request, analytics and your on hold messages all in one place.

Professionally recorded phone messages and greetings are the perfect way to promote and re-enforce your business brand when customers call the business. They will put a professional touch to any message and enhance your business image. Choose between a male or female voice, recorded in the tone best suited to your business. Ideal for Business Intro Messages at the start of the call, Auto Attendant (IVR) prompts, Voicemail greetings such as one for an After-Hours Service, and On-Hold Messages. Incorporate background music for that extra touch.
The common scripts include: “The next available representation will be with you shortly” or simply “We will be with you shortly”. These messages often work best when coupled with expected waiting time announcement.