✦ AI Voice
How Does an AI Voice Agent Answer Calls?
When an inbound call hits an AI voice agent, the call is answered in under one second, the caller's speech is converted to text, a language model generates a response based on the business's configured knowledge base, and a text-to-speech engine converts the response to voice. This cycle happens in 1–3 seconds per exchange, fast enough to feel like a normal conversation to the caller.
The technical stack of an AI voice call:
1. Call routing: incoming calls to your business phone number are forwarded to the AI voice platform (either as the primary answer or as an overflow when lines are busy). The forwarding uses standard carrier call forwarding — no changes to your existing phone system are required in most configurations.
2. Speech-to-text (STT): the caller's speech is transcribed in real time by a speech recognition engine. Modern STT systems have 95%+ accuracy for clear speech and handle regional accents, industry terminology, and names reasonably well when the model is primed with relevant vocabulary.
3. Language model processing: the transcribed text is processed by a large language model configured with your business's specific knowledge base — your services, service area, pricing ranges, process, and any specific handling instructions for different call types. The model generates the appropriate response.
4. Text-to-speech (TTS): the response is converted to natural-sounding speech by a TTS engine. Current TTS quality is high enough that the voice is perceptually close to human speech, with natural cadence and appropriate inflection.
5. Action execution: alongside the voice response, the AI can trigger actions — creating a calendar booking, sending a confirmation text to the caller, logging the call details to a CRM, or routing the call to a human.
The complete cycle from caller speech to AI response typically takes 1.5–3 seconds. Long pauses feel unnatural; the engineering challenge in AI voice is keeping the response time short enough to feel conversational without sacrificing response quality.
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