The main difference between VoIP and Cloud telephony is that VoIP is a technology that allows voice calls to be made over an Internet connection rather than a traditional phone line. On the other hand, Cloud telephony, also known as hosted telephony or cloud PBX, is a broader term encompassing all telephony services that are hosted in the cloud, including VoIP. While VoIP focuses primarily on making voice calls over the internet, Cloud telephony provides a range of services such as call routing, recording, analytics, and integration with other cloud-based applications.