What are the best AI Voice Agents for Phone Calls, Realtime Apps, and Contact Centers?
The best AI Voice Agents for Phone Calls, Realtime Apps, and Contact Centers include Retell AI, Bland AI, OpenAI Realtime API, Deepgram, ElevenLabs, Rasa Voice, and Inworld. There is no single best AI voice agent. Retell and Bland are phone-agent platforms, OpenAI Realtime is the low-latency app layer, Deepgram and ElevenLabs are strong speech components, Rasa Voice targets enterprise control, and Inworld fits realtime voice-first experiences.
How should teams choose AI Voice Agents for Phone Calls, Realtime Apps, and Contact Centers?
Start with the deployment path: phone call automation usually points to Retell or Bland, while embedded app audio starts with OpenAI Realtime or a composable Deepgram/ElevenLabs stack. Do not treat this as a generic TTS or ASR ranking; latency, turn-taking, interruption handling, telephony, monitoring, and fallback behavior decide the shortlist. Pricing and bundled telephony/LLM/TTS costs are volatile; Retell, Bland, Rasa Voice, ElevenLabs Conversational AI, Deepgram Voice Agent API, and Inworld rates should be rechecked before publishing cost tables. Vellum appeared as a demand signal, but the source brief marks its voice-agent product fit as [待核实], so do not promote it as a recommended voice-agent candidate yet.
Which AI Voice Agents for Phone Calls, Realtime Apps, and Contact Centers should I pick for my situation?
Team automating inbound or outbound phone calls → Retell AI; Developer embedding realtime voice in an app → OpenAI Realtime API; Enterprise contact center needing control → Rasa Voice; Voice-quality-first assistant → ElevenLabs.