Wholesale VoIP (Voice over Internet Protocol) refers to the bulk purchase and sale of telephony minutes, SIP trunks and voice services over IP networks between carriers or service providers, rather than retail sales to end users. In practice, wholesale VoIP providers maintain carrier-grade networks that route and terminate calls across global destinations. The global VoIP services market was roughly $172.5 billion in 2025 and is projected to nearly double by 2030. Within that, the wholesale voice carrier market was about $27.8 billion in 2025 and is expected to reach $42.3 billion by 2035 (≈4.3% CAGR). 

These networks handled on the order of 217 billion call-minutes in 2024. Such scale underpins everything from international calling to cloud PBX services. The remainder of this guide explains how wholesale VoIP works, who uses it, what services it includes, and how routing, pricing and quality are managed. We also cover security measures against fraud and criteria for choosing a provider.

What Is Wholesale VoIP?