Verified voice and conversational AI providers

This list covers voice AI providers and conversational AI providers with verified delivery in speech-to-text, text-to-speech, dialog systems, and telephony agents. Each entry is verified through evidence of shipped work (deployments, documented integrations, and third-party references) rather than self-declared claims or marketing copy. Providers appear here because they have accumulated a verification record on Trustgent, not because they pay for placement or sit on a particular plan tier. Telephony agent providers, real-time voice interfaces, and multilingual dialog systems all sit in the same pool and are evaluated on the same evidence. Ranked on earned verification level, then record count, then recency. Plan tier is never a ranking input.