AI Voice Agent Development — HAPP, ElevenLabs, Claude

A voice agent that works your phone line

Calls are where leads are most often lost: nobody picks up after hours, a manager forgets to call back, details never reach the CRM. A voice agent answers every call, talks to the person in natural speech, collects what you need and passes the result to your team.

We build and run these agents on three components:

HAPP for telephony: incoming and outgoing calls.
ElevenLabs for the voice: natural speech instead of a robotic one.
Claude for the conversation: understanding the caller, following your script and handling questions that were not in it.

What happens after the call

When a call ends, an n8n workflow takes over:

The call data goes into your CRM: contact, outcome and the details the agent collected.
A Telegram notification tells your team about the call, so hot leads do not wait.

You do not need to listen to every recording to know what happened.

Management, not a one-off setup

A voice agent is never finished on launch day. Real callers interrupt, mumble, change topic and ask things nobody predicted. That is why the work continues after the launch:

we read transcripts of real conversations;
we find where the agent misheard, looped or lost the caller;
we refine the prompt and the handoff rules, then check the next batch of calls.

Where it fits

Answering inbound calls and qualifying leads, including outside working hours
Calling back new leads from forms and ads while they are still warm
Booking appointments and confirming visits
First-line support with a handoff to a human for complex cases

Examples of what we can build

Technical support line for an online store. The agent identifies the order or product, looks the answer up in a knowledge base and escalates to a person when needed. After each call n8n parses the transcript, classifies the request, creates a lead in the CRM and alerts the team in Telegram at the right urgency level.
Booking agent for a service business (a sauna, a salon, a clinic). The agent walks the caller through a short booking dialog, then n8n creates the event in Google Calendar and sends the administrator a Telegram message with all the details. It works around the clock without anyone on shift.
Lead capture by phone and messenger. A voice agent collects the caller’s name, request, convenient callback time and phone number, while a chatbot in Instagram or Telegram answers from your knowledge base and hands off to a person when it does not know.

For text channels see AI chatbots. For wiring the agent into your other systems see AI process automation.

Frequently Asked Questions

What exactly do you build and run?

A voice agent that talks to your callers or calls your leads. It runs on HAPP for telephony, ElevenLabs for the voice and Claude for understanding and replying. We set up the whole chain, launch it, and then keep managing it: reading real call transcripts and improving the prompt.

What happens after a call ends?

An n8n workflow takes the call data and passes it to your CRM, then sends a notification to a Telegram chat so your team sees the result straight away. The fields and the format of the alert are agreed with you before launch.

Why do you keep working on the prompt after launch?

Real callers behave differently from the scenarios we write in advance. We review transcripts of actual conversations, find where the agent misunderstood, repeated itself or lost the caller, and adjust the prompt. The agent gets better with every batch of calls.

How much does it cost and how long does it take?

It depends on the scenario, the number of integrations and call volume, so we scope it after a short call and give a fixed quote. Telephony and voice usage are billed by the platforms based on actual minutes.