For a VoIP setup to work, you must have a modem or router (which should already be a part of your existing setup) and a device for the VoIP software to be downloaded onto (smartphone, laptop, tablet or computer). You don’t have to invest in a lot of telephony equipment if you have a high-quality internet connection for your business. There are some different types of equipment to consider with VoIP systems though, which include VoIP headsets and VoIP desktop phones.