Reference
Written to answer the question rather than sell you something, including where the honest answer is inconvenient for us. If you are evaluating vendors, these are the things worth asking them about.
Agents
An AI voice agent is software that answers or places phone calls, understands speech in real time, and books, qualifies or routes without a person on the line.
ReadAn AI receptionist is a voice agent deployed on a business's main phone line to answer inbound calls, triage them, and book appointments into a real calendar.
ReadGrounding means an agent answers only from a defined source of truth, such as your documents, prices and availability, not from the model's own memory.
ReadGuardrails are the explicit rules on what an agent may say and do: the topics it must refuse, the actions it may take and when it hands over to a person.
ReadVoice
Turn latency is the time between a caller finishing speaking and the agent replying: the one number that most decides whether a voice agent feels natural.
ReadBarge-in is the ability of a voice agent to stop talking the instant the caller starts talking, instead of finishing its sentence over them.
ReadSpeech-to-text converts spoken audio into written text. In a voice agent it is the first stage of every turn, and its errors propagate into everything downstream.
ReadText-to-speech turns the agent's written reply into audio. For live calls the metric that matters is time-to-first-audio, not the quality of the finished clip.
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