Voice agent, native speech-to-speech
One multimodal model listens and speaks; the lowest latency and the most natural tone.
Use it when
Conversational experiences where naturalness matters more than fine control, and the provider's voices and languages fit your audience.
The parts, top to bottom
across every level
Hover or tap any part to see what it does. The light shows the order a request moves through.
What happens, in order
- 1Audio stream in
- 2Realtime model reasons in speech
- 3Tool calls for data & actions
- 4Audio stream out
- 5Guardrails on transcript
- 6Handoff when needed
What we typically build it with
Trade-offs
The most natural prosody and the fewest moving parts, but fewer vendor choices and harder to swap voices or models independently. Realtime audio is billed per audio token (typically $0.06–0.11 per minute in measured sessions), so we model cost at volume and often pair it with a cascaded fallback.
Further reading
Problems this architecture solves
Generic problem statements with the flow and the outcomes the industry has documented.
Calls missed, callers on hold
Clinics, dealerships and service businesses lose bookings after hours and during peaks. IVR menus frustrate callers and staff repeat the same ten conversations all day.
How the system works
- Call arrives
- Streaming speech-to-text
- Agent reasons & checks calendar / CRM
- Streaming text-to-speech
- Book, confirm, hand off
Outcome: Voice agents replacing IVR resolve a majority of qualified calls automatically (66% at one Parloa customer) and cut wait times by a third or more, at turn latencies under a second. Parloa customer results
ArchitectureOther voice patterns
Voice agent, cascaded pipeline
Telephony → speech-to-text → agent with tools → text-to-speech, tuned for sub-second turns.
Use it when: Phone or in-app voice for bookings, support, collections and outbound reminders, where you need control over the model, the tools and the voice, and clear logs of what was said.
Flow
- 1Call via SIP / WebRTC
- 2Voice activity detection
- 3Streaming speech-to-text
- 4Agent reasons & calls tools
- 5Streaming text-to-speech
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