VoIP, or Voice Over IP, is becoming a very popular alternative to traditional phone lines. This type of service operates over the internet, allowing businesses to make calls without paying for a regular phone service. If you use VoIP, that is no reason to forego on hold messaging. In fact, many services are now VoIP compatible. This makes your low-cost phone option that much better, because you can still enjoy the same useful marketing service.
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.

Take your pick from these options and also remember that when you incorporate IVR and on hold music with an effective contact centre management system – you create a more efficient framework of ticket resolution.
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