Quick answer
Speech‑to‑speech (S2S) turns spoken input directly into spoken output, bypassing text intermediaries. In real‑time customer interactions, naturalness can dramatically improve engagement, but it often comes at the cost of higher latency.
Voxovo AI’s Ultra mode, powered by Gemini Live, is designed to deliver the highest naturalness while keeping turn latency within industry‑acceptable limits. This pipeline is accessed with `pipeline_mode: "voxovo0_ultra"`.
Ultra mode’s architecture includes a dedicated speech‑to‑speech stack that streams audio continuously. While the initial greeting uses pre‑cached knowledge‑base snippets, the rest of the conversation flows from a managed LLM and TTS engine.
How Voxovo AI works on Voxovo
A key differentiator is the Presence Buffer, a pre‑cached filler audio that fills any gaps caused by the LLM or tool processing. Callers never experience dead air, even when the system is fetching data or generating a response.
Live Sheet and Live Calendar are first‑party data sources that agents can access mid‑call. These tools eliminate the need for manual copy‑paste, allowing agents to pull contact details, schedule meetings, or retrieve ticket information on the fly.
With over 20 deep integrations—HubSpot, Salesforce, Google Calendar, Slack, and more—Voxovo’s mid‑call tools let agents perform CRUD operations without leaving the call. Custom HTTP APIs can also be invoked during a conversation.
Agency tenancy is supported through multi‑workspace functionality. Each workspace has its own analytics, user roles, and credit allocation, making Voxovo a practical choice for voice‑AI agencies managing multiple clients.
Implementation checklist
The combination of Presence Buffer, Live Sheet/Calendar, and a managed low‑latency stack ensures that callers perceive a truly conversational experience, regardless of the complexity of the tasks being performed.
In comparison, Vapi focuses heavily on developer‑oriented APIs and does not ship a native presence‑buffer solution; Retell emphasizes low‑latency telephony but lacks real‑time data access tools; Bland scales outbound dialing but offers no agency‑friendly tenancy.
While Retell’s latency is competitive, it does not provide a mechanism to silence dead air, which can be noticeable to callers during data fetching. Voxovo’s buffer eliminates this gap, improving caller satisfaction.
Voxovo’s Live Sheet gives agents live access to structured data, whereas Vapi’s data handling requires manual prompts or external scripts—adding friction to the workflow.