Voice over Internet Protocol, similar to cellular networks, is handled digitally. Ringback is one way in which VoIP is setting itself apart from traditional telephony services. When you subscribe to business VoIP, your phone will most likely come pre-programmed with both ringback and on-hold music. VoIP providers, unlike cell phone carriers, don’t charge extra for ringback tones. Not only that, you can upload your own custom ringback and on-hold music, such as a favorite song, a customized soundtrack, or even a customized greeting or up-sell message. VoIP subscribers can select different connect and on-hold music by accessing their online portal.
Send that message, or get information needed, and press thumb button at bottom center screen/phone and all apps on “Home Screen” will return, If need to return to actual call in progress/or on hold, press the center button twice quickly.

It is vital that you put your most important messages first, it’s all about interest and impact. It is a ‘Fact’ that 90% of callers put on hold without dialog or music will hang up within the first 40 seconds and 34% of those callers will be lost forever. Callers stay on hold up to three times longer with on hold messages.
"Messages on hold are often one of the most painful of customer ordeals. But when done right by Scott Greggory and crew with actual humor, it takes a customer hassle and elevates it to a customer experience you tell others about. Click through to check out a couple samples. They're addictive, and brilliant marketing." - Bill Cusick / Author & Customer Experience Expert