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.
It's the only song Alex Cornell has ever written. Cornell was one of the co-founders of UberConference, and in addition to being a designer, is a singer and guitar player who had always found songwriting frustrating. "Then I just came to it one day," he says. "I just wanted to write a pleasant melody designed to be heard over the phone." With encouragement from Walker, Cornell started messing around with the lyrics. He wrote and recorded it in one night, in 2012, as a voice note on his phone — and thus, this self-aware hold song was born, and lives on, seven years later.

With our premium on-hold service you can schedule an entire on-hold production, or even individual messages for playback on your device at a specific time of day, day of the week or time of year.
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.