I realize there are still those that swear by voicemail and use it regularly in business. However, consider that the telegraph was once an innovative form of communication!
I have a confession to make: I haven't recorded a new voicemail greeting in nearly a decade. Since then, I've (hopefully) become more articulate, poised, and self-assured. But hear my voicemail recording, and you'd think I was still new to the work world, a little unsure of myself — and probably not an authority.

Assessing the number and quality of features available can also staggering. We assumed you'll want the basics of call forwarding, voice mail boxes, and a standard menu that lets customers select where they want to direct their calls. But consider other features, like applications that will allow portability from business to cell phone, features that will translate voicemail to text or email, call recording, fax services, and even features that will work with Google documents, Salesforce, or your office software. How much of these additional features does your company really need, and how much are they worth to you?
For larger systems, and for systems where security is critical for things like being compliant to vertical regulatory needs, your current internet connection might not be adequate. The internet doesn't do quality of service (QoS), and bandwidth can be unpredictable. Network congestion can ruin a conference call, and activities such as DNS hijacking can put your business and data at risk.