On a phone call, silence

On a phone call, silence is the bug.

A text chatbot can take three seconds to reply and nobody minds. A voice agent can't. Leave a caller in silence for a beat too long and they say "hello?", start talking over it, or hang up.

That one fact shaped everything we built on Talk-Lee, an AI voice agent that answers business calls for healthcare, real estate and finance teams. Scheduling, support, lead qualification, around the clock.

The goal was a reply in under 500ms. You don't get there with a faster model. You get there by making sure nothing waits for anything else.

→ Speech to text streams while the caller is still talking

→ An LLM and intent layer keeps track of what they actually want

→ Text to speech streams back, so the agent starts talking before the whole answer is ready

→ An orchestrator decides in real time whether to answer, book or hand off to a person

Then it has to do something useful. It books into Calendly, logs the lead in HubSpot, and passes the hard calls to a human with the context already attached.

Where it landed. Under 500ms responses, 1,000+ concurrent calls, 30+ languages, GDPR and TCPA compliant.

Third project in a row with the same lesson. The model is the easy part. The plumbing around it decides whether anyone keeps using it.