What is VoIP?

VoIP (Voice over Internet Protocol) transmits phone calls over the internet instead of phone lines — what that means for business buyers.

VoIP (Voice over Internet Protocol) is the technology that carries phone calls as data over IP networks — the internet — instead of dedicated telephone lines. Your voice is digitized, packetized and routed like any other internet traffic, then reassembled at the destination.

Why businesses care

VoIP is the foundation of modern business telephony: it’s what lets providers like RingCentral or Nextiva offer calling from desk phones, computers and mobiles under one subscription, with features (auto-attendants, recording, transcriptions) that were hardware-bound in the analog era.

What quality depends on

VoIP call quality tracks your network, not the vendor’s marketing: sufficient bandwidth, prioritized traffic (QoS), and reliable connectivity matter more than any feature list. Businesses in multi-site or bandwidth-constrained situations often pair VoIP with SD-WAN to protect call traffic.