We bought a Raspberry Pi 3 Model B with clear case and 2.5A power supply for $45 to host the service. Once that arrived, I attached the Pi to a monitor, keyboard and mouse that I already had. Using another computer, I downloaded the Raspian operating system to a microSD card which is need to boot up the Pi. You can purchase a bundle that includes a pre-loaded microSD card, but if you don’t do that, the Pi won’t boot, so you can’t use it to get the operating system.
The best part about this visual voicemail app is that it can send you voicemail alerts even when your phone is off or out of network coverage. This works well in tandem with the PhoneFusion ONE

If you’d like all your clients regardless of their geographical locations to receive the same greeting messages, you’ve to take your systems to the cloud. With hosted predictive dialers in place, you can forward messages to different destinations and extensions without straining your team or budget. The best thing is that with virtual voicemails, your outbound caller ID will be localized increasing chances of clients living a message at the tone.
Once you have your message, you need to actually record it. The exact process varies depending on whether you’re using a cell phone or office phone, but here’s the basic process: Press the voicemail button, or press and hold 1 on most cell phones. Enter your password. Record your message. Listen to the message you just recorded. Follow the prompts to save your message. Following Up on Voicemail Messages