OnSIP’s enhanced music on hold allows each user to select their own hold music, so each caller gets different tunes depending on who put them on hold or which menu they came in through. (You can even change your hold music for the holidays or for a special event!) You can also record a customized hold message to engage your callers while they’re waiting on the line. This presents a great opportunity to advertise additional features of your business or inform your audience of a special sale or promotion.
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.

Power is on, the USB will play on computer, tried to use a different USB with the machine still woulnt work. This device replaced my 5-CD changer to provide background music for a business phone system. This is a lot less expensive than another CD changer, a lot smaller, and it allows us to hear the song being played (with its small internal speaker.) the volume control allows us to set the volume that caller will hear. Our CD player simply could not do that. Top reviews from other countries
“Ever since we added the On Hold messaging System, we receive more patients than ever asking about our new procedures. The service has paid for itself over and over again.”