The fundamental difference between simple VoIP and VoLTE is that VoLTE requires a Quality-of-Service or QoS component.*
Basically de difference between VoIP and VoLTE is that VoLTE requires a QoS (Quality of Service) component.
Typically, over-the-top VoIP applications like Skype and Google Voice rely on the Internet to deliver packets. The problem is that Internet delivery is done on a “best effort” basis; all you can do is get your packets to the cloud and cross your fingers. VoLTE, on the other hand, uses the IP Multimedia Subsystem (IMS) and new radio access network features to ensure low latency, improved error correction in fringe areas, and other features that guarantee voice service as good as or better than any we’ve ever experienced.
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