The equipment you need for VoIP depends on the method of Voice Over Internet Protocol you're adopting. The first basic thing you'll need is a broadband connection - preferably a high-speed connection so it's more reliable and with unlimited data so you can talk as long as you like.
VoIP-enabled phones:
VoIP phones are wireless phones designed to work with IP technologies. These wireless phones don't need to be connected to a wire as a landline phone would. However, they pretty much have the same features you'll find on a business phone, such as do not disturb, conference calling, and call waiting.
Software or Apps:
You can use software or apps on desktop systems or smartphones to utilise Voice Over Internet Protocol capabilities. The software and apps allow you to use the functions of a physical device like a smartphone to communicate remotely using the internet.