The best business VoIP services in 2026: Expert tested and reviewed

This 2026 ZDNET guide compares leading business VoIP providers (RingCentral, 8x8, DialPad, Intermedia Unite, Nextiva, plus alternatives) across pricing, features (AI tools, video, messaging, analytics), integrations, and ideal use cases (e.g., call quality focus, Microsoft Teams alignment, multichannel CX). It details selection criteria (scalability, cost, features, mobile, AI, support, customer feedback), key capabilities to evaluate (call management, capacity, reach, call quality, advanced AI-driven features), and provides industry updates (AI adoption, market growth) along with practical notes on bandwidth needs, reliability limits, and basic security considerations, including a brief mention of a VoIP-based botnet exploiting default passwords.