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 waiting queue allows the caller to wait on the line and should not be longer than 5 minutes. The queue announcement may also be introduced after a "Welcome Message”. The waiting announcement is then cut immediately after the end of the "Welcome Message". The pauses between the announcement blocks in the queue should be about 30 - 60 seconds. With us, you can choose the desired durations. Here, you can get the right background music for your queue.

A phone system with a Music On-Hold input connection. Have multi-line phones, a hosted PBX or VOIP phone system? Contact us and we'll get you set up!
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