Zenkoders builds voice AI agents that answer and make phone calls in a natural voice, book appointments, qualify leads and update your CRM, 24/7. Built on Twilio, Vapi, OpenAI and Claude, our agents pick up in under one second and resolve most calls without a human. Pilots go live in 4 to 6 weeks.
A voice AI agent is software that holds a real phone conversation. It listens, understands what the caller wants, takes action in your systems and replies in a natural voice, all within about a second. We design each agent around your actual call flows: what people call about, what they need answered, what has to be booked or updated, and when a human must take over.
Every agent we deliver includes the telephony setup, conversation design, integrations, testing and a live dashboard, so you get a working phone line, not a demo.
Answers every call in your brand voice, handles FAQs from your knowledge base and routes or books on the spot, including nights, weekends and peak hours.
Runs appointment reminders, follow-ups, lead qualification, renewals and surveys at scale, with consent tracking and do-not-call handling built in.
Checks real-time availability in Google Calendar, Outlook, Calendly or your practice software, respects buffers and confirms by SMS.
Creates and updates contacts, deals and tickets in HubSpot, Salesforce, Zoho or Zendesk, so every call leaves a clean record.
Detects the caller’s language automatically and replies in English, Spanish, French and other languages without a menu.
Full transcripts, recordings, summaries, booking outcomes and escalation reasons in one dashboard to improve the agent every week.
Voice AI pays back fastest wherever the phone is a revenue channel and calls are missed, repetitive or after hours. These are the use cases we see the strongest results in:
Every missed call is a missed booking. See a voice AI agent answer, book and escalate a real call for your business in a 30-minute demo.
From a single AI receptionist to a multi-location contact centre, we build the voice layer, the logic and the integrations end to end.
Purpose-built voice agents designed around your call types, scripts, compliance rules and systems, with a custom voice and tone that matches your brand.
A 24/7 front desk that answers in under a second, books appointments, answers FAQs and transfers urgent calls with full context to your team.
Automated reminder, follow-up and qualification calls that run at the times your customers answer, with results written back to your CRM.
Replace “press 1 for sales” menus with natural conversation that understands intent and routes callers to the right person or workflow.
Voice agents for clinics and practices with PII redaction, encryption at rest and in transit, audit logs and no transcript storage when required.
Call audits, ROI modelling and a 4 to 6 week pilot on one real call flow, so you see the numbers before committing to a full rollout.
A clear six-step process takes you from your current call data to a live, monitored voice agent.
We review recordings, call logs and scripts to find the call types worth automating, the questions callers ask and where calls are lost today.
We map the dialogue: greetings, intents, follow-up questions, confirmations and the exact rules for when the agent hands over to a human.
We connect your knowledge base, calendar, CRM and telephony, and set up the phone numbers or SIP trunk the agent will answer.
We build the agent, choose and tune the voice, and optimise speech recognition for your names, products, accents and terminology.
We run hundreds of simulated and real test calls for latency, accuracy, interruptions, edge cases and failure paths before go-live.
We go live in stages, watch every call in the dashboard and improve prompts, flows and integrations weekly based on real outcomes.
We don’t just connect a voice API to a chatbot. We ship voice products to production and run them, which is why we know where calls break: slow responses, misheard names, callers who interrupt, and integrations that fail mid-booking.
Our own AIVentra receptionist answers in under one second, resolves 94% of calls without a human and holds a 99.9% uptime SLA. We bring the same architecture, testing playbook and monitoring to your agent, and you own the code, prompts and data from day one.
With 1,000+ projects delivered since 2019 for startups and enterprises across the USA, our team covers telephony, speech, LLMs, backend integrations and compliance in one place.
A production voice agent is a real-time pipeline. Each layer below is engineered and tested on its own, because one slow or inaccurate layer is enough to make a call feel robotic.
Calls arrive through Twilio, Telnyx or Vonage phone numbers, or over SIP from your existing PBX. We handle number provisioning, call routing, recording consent and warm transfers to staff, and can run in parallel with your current phone system during rollout.
Streaming recognition with Deepgram or OpenAI Whisper converts speech to text while the caller is still talking. We add custom vocabulary for your staff names, products and locations, and tune endpointing so the agent knows when the caller has finished speaking.
GPT-4o, Claude or Gemini decides what the caller needs and calls tools: check availability, create a booking, look up an order, update the CRM. Answers come from your verified knowledge base through retrieval, not from the model’s memory.
Natural voices from ElevenLabs, Cartesia or Azure Neural TTS, streamed sentence by sentence so the agent starts speaking immediately. We tune pace, tone and pronunciation to match your brand.
Natural conversation needs a reply in under a second. We stream every layer, support barge-in so callers can interrupt, cache common answers and deploy close to your callers to keep responses fast.
Confidence thresholds, topic limits and output validation stop the agent from guessing. Trigger phrases, emergencies or repeated misunderstandings pause the call, alert your team by SMS with context and transfer the caller.
HIPAA-ready mode with PII redaction, AES-256 encryption at rest, TLS 1.3 in transit, role-based access and full audit logs. Your data is never used to train public models, and recordings follow your retention policy.
Twilio
Telnyx
Vonage
SIP / WebRTC
Vapi
Retell AI
LiveKit
Pipecat
Deepgram
OpenAI Whisper
ElevenLabs
Cartesia
Azure Speech
OpenAI GPT-4o
Anthropic Claude
Google Gemini
Llama
HubSpot
Salesforce
Google Calendar
Calendly
Zendesk
Zapier / Make
AWS
Azure
Node JS
Python
MongoDB
PostgreSQL
A voice AI agent is software that holds a natural phone conversation. It converts the caller’s speech to text, uses a large language model to understand the request and take actions such as booking or updating a CRM, and replies with a lifelike synthetic voice, usually within one second.
Most projects run from $18,000 for a single-flow pilot to $30,000–$75,000 for a production agent with several call types and integrations. Enterprise, multi-location or compliance-heavy platforms range from $75,000 to $150,000+. Telephony and AI usage are billed separately at cost, typically a few cents per call minute.
A focused pilot on one call flow goes live in 4 to 6 weeks. A production agent with multiple flows and integrations usually takes 8 to 12 weeks, and enterprise rollouts 12 to 20 weeks depending on compliance and integrations.
Our agents sound natural and respond in under a second, so most callers have a normal conversation. We still recommend a short disclosure in the greeting, and in some states and industries it is legally required. We configure this to match your compliance needs.
Yes. You define the triggers, such as emergencies, complaints, requests to speak to someone or low confidence. The agent sends your team an SMS or Slack alert with the call context and transfers the caller, so the person who picks up already knows why they are calling.
We work with Twilio, Telnyx, Vonage and SIP trunks from existing PBX systems, and integrate with HubSpot, Salesforce, Zoho, Zendesk, Google Calendar, Outlook, Calendly and custom APIs or practice-management software.
We build HIPAA-ready agents with PII redaction, AES-256 encryption at rest, TLS 1.3 in transit, audit logging and optional no-transcript storage, and sign BAAs with supported providers. Compliance also depends on your own policies, so we review the setup with your compliance officer.
English, Spanish and French are standard, with automatic language detection at the start of the call. Most major languages are supported by our speech and voice providers and can be added per project.
The agent asks a clarifying question, confirms key details such as names, dates and phone numbers back to the caller, and escalates to a human if confidence stays low. Every unresolved call is flagged in the dashboard so we can improve the agent.
Yes. You own the source code, prompts, conversation design and all call data. Your data is never used to train public AI models, and we can deploy in your own cloud account if required.
Tell us how your business handles calls today. We’ll show you which calls a voice AI agent can take over and what it would cost.
