For a VoIP system to work, it needs a means of routing calls between users or to the outside world. In a cloud-based system, this gets handled by a virtual PBX. In the cloud, this routing is managed by your VoIP provider, which is part of why you're paying them. Whatever vendor is supplying that is also running a large PBX operation in a data center somewhere, and slicing off a little of it to dedicate to your organization in exchange for your subscription fees.
There are plenty of alternate options for trade voicemail messages, including skilled greetings, casual messages, and even droll ones. Hold in mind your impress converse and aim target market to settle on the tone. And consist of directions for folks who name.

That's the basics of UCaaS, but the concept is constantly evolving to include more communication and collaboration technologies. Those capabilities also get tweaked to provide new benefits, sometimes general, sometimes aimed at specific verticals, like healthcare, for example. The key is integration. Voice is becoming integrated with other back-end apps, and UCaaS is making that easier. In fact, it's become so popular that it's seen rapid growth over the last several years as recent research from Statista bears out.
VoIP packages generally offer the most features at economical pricing, but are subject to the vagaries of your current ISP. You may also be on the hook for purchasing their equipment.