For small businesses, there are a variety of voicemail service providers you can use that offer different features. From transcription and voice to text to more convenient features of handling multiple phones through one number, availability varies by service. Shared voicemail and call routing is intended for multiple access and directing calls to one or multiple phones. Mobile apps are also available that allow you to check your messages from your phone. The below infographic outlines the current state and trends of voicemails.
However, unlike a traditional PBX, the service is hosted in the cloud. By setting up fail over actions for Auto Attendants, and groups you can make sure that calls will be delivered. You also have the options to setup Find-Me/Follow-Me or Call Forwarding for each user extension.

Responding to voicemails is time-consuming. Fortunately, with the right greeting, you might be able to save yourself some hassle. If you don’t have an auto attendant, you can give callers the information they are looking for with your voicemail greeting. Of course, this means that your greeting may be a little lengthy, but that can work in your favor as callers will only stay on the line to leave a message if they still need assistance.
Internal Voicemail Greeting Examples: This is used to greet people who call you from within your company (i.e. from another extension). External Voicemail Greeting Examples: This greeting will be played for people who call from outside your company. Your telephone system's automated attendant may play a general company greeting that all