When transitioning your business phone system from landline to VoIP telephony, SIP trunking and VoIP are strong options. Both types of phone systems offer internet-based VoIP calling for your whole network. While SIP trunking and VoIP overlap in many ways, each phone system has unique use cases and features. This article will compare SIP trunking vs VoIP, outlining their pros and cons, similarities and differences, and when to use each.