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Voice AI Agents

A voice agent that takes the call and finishes the job 

Phone and in-app voice agents built on low-latency speech pipelines. They hold a real conversation, call your booking, CRM, and order systems to actually do the thing, and transfer to a human with the full context the moment the call goes outside their scope.

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Voice AI Agents · live render

24/7

Call coverage, no rota

3+

Years building production systems

0

Unscoped write permissions

Built on the realtime speech and telephony stack

OpenAI RealtimeDeepgramElevenLabsTwilioLiveKitTool callingTypeScriptPythonPostgres

Why voice bots get hung up on

Callers do not hate automation. They hate waiting for it. 

Every voice deployment that gets abandoned fails on the same handful of things, and four of the five are engineering problems rather than script problems.

I build against the opposite constraints: a latency budget set before the architecture, barge-in support so the caller can interrupt, tool calling into the systems that make the call useful, warm transfer with the transcript attached, and per-call tracing from the first production call.

A voice AI agent handling a live customer call while acting on backend systems
Low latency · interruptible · acts · transfers warm

What makes a caller press zero:

  • Latency you can hear

    A second and a half of silence after the caller stops talking reads as broken. Latency budget is an architecture decision, not something you tune at the end.

    01
  • It cannot be interrupted

    Real conversations overlap. An agent that keeps reciting through an interruption feels like an IVR menu with a nicer voice.

    02
  • It talks but cannot act

    Explaining the booking process is not booking. Without tool access into the real systems, the caller still ends up doing the work themselves.

    03
  • The handoff loses everything

    Transferring to a human who has to ask for the name, the order number, and the reason again is worse than never having answered.

    04
  • No transcript, no accountability

    Without recordings, transcripts, and per-call tracing, nobody can tell why a call went wrong or prove what the agent committed to.

    05

100%

Calls transcribed and traced

1

Latency budget set before build

0

Blind transfers to a human

What a voice build covers

From a call flow on paper to a number people can ring 

The speech pipeline, the conversation design, the tool layer, and the handoff. Each stage produces something you can hear or inspect.

Service 01

Call-flow design & spec

Before anything is built we write down what the agent may say, what it may do, what it must never do, and the exact conditions that hand the call to a person. That document is what you approve.

  • Intent and outcome map per call type
  • Explicit out-of-scope behaviour
  • Escalation triggers written down
  • Compliance and disclosure lines

The stack behind it

Voice is a latency problem wearing a conversation costume 

Most of the engineering in a good voice agent is not in the prompt. It is in the milliseconds, the interruptions, and what happens when a tool call is slow.

The pipeline that decides whether the agent feels like a conversation or a hold message.

OpenAI RealtimeDeepgramElevenLabsStreaming STT / TTSBarge-inVoice activity detectionLatency budgeting

What gets built

Voice agents callers do not try to escape 

The difference between an agent people talk to and one they press zero through is almost entirely in this list.

A caller in natural back-and-forth conversation with a voice agent
Interruptible, like an actual conversation
Capability 01

Natural, interruptible conversation

Streaming speech in both directions with barge-in, so a caller can cut in halfway through a sentence and be heard. The latency budget is set before the architecture, not tuned after the complaints.

  • Streaming speech-to-speech
  • Interruptions handled mid-sentence
  • Filler handling while tools run
  • Voice and pacing tuned per brand
Voice agent calling backend systems to complete a caller's request
It does the thing, not just describes it
Capability 02

Actions, not just answers

The agent books the slot, checks the order, updates the record, or raises the ticket through scoped calls into your real systems, with anything irreversible or financial behind an explicit confirmation.

  • Calendar, CRM, and order integrations
  • Scoped permission per action
  • Spoken confirmation before writes
  • Graceful failure when a system is down
A human agent receiving a warm transfer with full call context
Nobody repeats themselves
Capability 03

Warm handoff to a person

When the call goes outside scope, the human picks up with the transcript, the intent, and the records the agent already pulled. The caller never starts again from their name.

  • Transcript and summary on transfer
  • Trigger on confidence or sentiment
  • Screen-pop for the receiving agent
  • Callback path when nobody is free
Voice agent answering from a grounded company knowledge base
Grounded, not remembered
Capability 04

Grounded in your real content

Answers about policy, pricing, or products come from retrieval over your own documents rather than the model's memory, with the same confidence floor and refusal behaviour as a text assistant.

  • Retrieval over policy and product docs
  • Refusal below a confidence floor
  • Live lookups for price and stock
  • No invented commitments on a call
Call analytics dashboard showing transcripts, traces, and escalation rates
Auditable, call by call
Capability 05

Every call inspectable

Recording, transcript, and a trace of every tool call the agent made, plus an after-call summary written into your system of record so the next person has the history without listening to audio.

  • Recordings and searchable transcripts
  • Tool-call trace per conversation
  • After-call summary written back
  • Escalation and drop-off analytics

Want to hear one before you commit to anything?

Voice is the one thing you cannot judge from a document. Describe the call type you have in mind and you will get an honest read on latency, what it can realistically handle, and where a human still has to sit in the loop.

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Where voice agents earn their place

Same pipeline, different thing at stake on the call 

Latency, interruption handling, and warm transfer are constant. What changes is what the agent is allowed to commit to without a human.

Zara, the AI voice receptionist I built, booking appointments through a live Google Calendar integration

Appointments & scheduling

Booking, rescheduling, and reminder calls against a live calendar, with confirmation spoken back before anything is written.

  • Live calendar availability
  • Reschedule and cancel flows
  • Spoken confirmation before booking
  • Outbound reminder calls

How a voice build runs

Hear it early, scope it hard, scale it last 

Voice is judged in the first ten seconds of a call, so a callable prototype comes before almost everything else.

01

Call-flow spec

The call types, what the agent may commit to, what it must refuse, and the exact escalation triggers. Some call types are ruled out here deliberately.

Deliverables

  • Call-flow document
  • Scope boundaries
  • Escalation triggers
02

Callable prototype

A test number you can ring within the first weeks, so latency, voice, and interruption behaviour are judged by ear rather than described in a document.

Deliverables

  • Test number
  • Latency measurements
  • Voice selection
03

Tool integration

Wiring the agent into the calendar, CRM, or order systems that make the call useful, with permissions scoped per action and confirmation on writes.

Deliverables

  • Integration wiring
  • Permission scopes
  • Failure behaviour
04

Handoff & guardrails

Warm transfer, screen-pop context, refusal paths, disclosure lines, and the behaviour when a backend call times out mid-sentence.

Deliverables

  • Transfer flow
  • Guardrail suite
  • Timeout handling
05

Call-set testing

A fixed set of scripted and adversarial calls run against the agent before launch, so regressions are caught by a test rather than a customer.

Deliverables

  • Regression call set
  • Scored results
  • Failure analysis
06

Launch on real numbers

Production routing with recording, transcripts, tracing, and cost-per-call dashboards live from the first call.

Deliverables

  • Production routing
  • Call analytics
  • Cost dashboards
07

Tune, then scale volume

A tuning window on real traffic before routing more call types to the agent, with the escalation log driving what gets fixed next.

Deliverables

  • Tuning report
  • Updated call set
  • Volume rollout plan

Why work with me

Voice agents that survive contact with real callers 

Demos are recorded in a quiet room by someone who knows the script. Production is an impatient caller on a bad line who interrupts.

Latency is a design constraint

A per-hop latency budget is set before the architecture, because you cannot retrofit responsiveness onto a pipeline built without it.

It has to be able to act

Tool calling into your real systems, scoped per action, with confirmation on anything irreversible. An agent that only talks moves the work rather than removing it.

The handoff carries context

Warm transfer with transcript and intent attached. Making a caller repeat themselves is the fastest way to lose the goodwill the agent just earned.

Every call is inspectable

Recording, transcript, and a trace of every tool call, so a bad call can be explained rather than argued about.

12+

Projects shipped end to end

3+

Years in production software

100%

Calls traced and transcribed

0

Blind transfers by design

Frequently asked

Questions people ask before we start 

Have a phone line eating hours that nobody enjoys?

Tell me what the calls are and what a good outcome looks like. You will get an honest read on which call types a voice agent can take today, which ones it should not, and what the build looks like.