On top of that, they're often expected to provide more advanced functionality through software, like shared meeting collaboration, voicemail to email transcription, and call recording. And lest we forget, many businesses still need a service that will connect to the public switched telephone network (PSTN).
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VoIP stands for Voice over Internet Protocol. Although often used as a synonym for virtual phone numbers, VoIP numbers actually differ from them. While the former use private data centers to route calls over existing land and cell phone lines, VoIP numbers use public internet for routing calls. Both solutions are less expensive than some traditional phone services and they enable you to take and make calls on the go. VoIP numbers are less reliable as they depend on the strength of your internet connection.
The problem there is that VoIP traffic is much more sensitive to network bumps and potholes than most general office traffic. That translates to garbled conversations, difficulty connecting over Wi-Fi, or (worst case) dropped and lost calls. If your business is small and your network is essentially contained in one or two wireless routers, then your configuration and testing headaches might be fairly easy (though still there). For medium and larger networks, these tasks can be complex and time-consuming, which translates into added cost in terms of man-hours.