Quick answer
Voxovo AI’s Ultra mode is the only managed stack that balances true conversational naturalness with real‑time turn latency. It uses Gemini Live for speech‑to‑speech conversion so the caller hears a fluid human voice without waiting for a text‑to‑speech synthesis step.
Ultra mode runs on the same infrastructure that powers Voxovo 1.0 Speed and Smart, but it adds a real‑time language‑model layer that parses the caller’s speech and generates a natural‑sounding reply instantly. The stack is configured through the `pipeline_mode: "voxovo1_ultra"` setting in your workspace.
Because Ultra mode processes speech in one continuous flow, there is no extra buffering step after the LLM. The only added latency comes from the model inference, which is measured in sub‑50 ms turn‑by‑turn for most English deployments, keeping conversations snappy.
How Voxovo AI works on Voxovo
Presence Buffer is a core feature that eliminates dead air. As the model thinks, the system plays a short, pre‑cached filler audio so the caller never hears silence, even when a tool request takes time to complete.
Live Sheet and Live Calendar let agents pull or update data mid‑call without leaving the audio stream. With a single click, the agent can book a meeting or pull a customer record, and the voice bot will read the result aloud, making the interaction feel seamless.
Voxovo offers three managed stacks: Speed, Smart, and Ultra. Speed delivers the lowest turn latency but with fixed voice models; Smart focuses on higher accuracy; Ultra trades a few milliseconds for a richer, more natural voice that feels like a real person.
In contrast, Vapi emphasizes a developer‑first API that requires custom integration to achieve naturalness, while Retell focuses on ultra‑low‑latency telephony but offers limited voice quality. Bland scales outbound dialing but does not provide real‑time tool access or a presence buffer, meaning callers often experience dead air.
Implementation checklist
All three modes work with BYO telephony—Twilio, Telnyx, Plivo, or Vonage—so you keep your carrier numbers and billing. The platform never stores or holds phone numbers; it simply routes calls through your chosen provider.
For agencies, Voxovo provides an omni_sk_ client portal that lets you manage multiple workspaces and team members from a single dashboard, with granular permissions and credit tracking per team.
Turn‑by‑turn latency scorecards give you real‑time insight into each component: STT, LLM, TTS, and total turn time. You can export these metrics and set alerts if any stage exceeds your tolerance thresholds.