Fincall: the agentic phone system for AI builders

Build phone agents by talking to Claude.

Fincall has an MCP server. Add it to Claude Code, or to Claude as a custom connector, then ask for what you need: a number, an agent, a test call, a summary of yesterday's calls.

Create an account. Sign up and make an API key.
Run the command. Fincall's tools appear in Claude.
Ask. Claude finds the number, writes the agent and routes the calls.

claude mcp add --transport http fincall \
  https://fincall/mcp \
  --header "Authorization: Bearer fc_live_…"

Make a support line for my app on a Melbourne number. Look customers up through my MCP server at mcp.yourapp.com and transfer anything urgent to 0400 111 222.

✓ search_numbers ✓ buy_number ✓ create_agent ✓ assign_number

Done. Your support agent is live on 03 5213 3262. It looks callers up through your MCP server and transfers urgent calls to 0400 111 222. Each finished call posts the transcript and summary to your webhook.

What you can build on it.

Numbers, agents and people share one phone system, and your code can start, watch and read every call.

A phone number for your product.

Point a number at an agent. It answers on the first ring, calls your tools while the caller is on the line, and transfers to a person when it should.

Your system prompt, greeting and voice
Your MCP servers and HTTP tools, called mid-call
Context fetched from your app before the agent says hello
Keyterms so product and place names transcribe correctly

Sam PatelInbound, support agent

9:02Answered on the first ring
9:02get_account: Pro plan, invoice overdue
9:04Payment link sent by your app
9:05call.completed posted to your webhook

Calls that start from your code.

One API request places an AI call. Pass in whatever the agent needs to know, and the outcome comes back to your webhook when the call ends.

Reminders, confirmations and follow-ups
Any JSON context, read by the agent during the call
Click-to-call that rings your user first, then the customer
Transcript, summary and recording on every call

// POST /api/calls
{
  "mode": "agent",
  "agent_id": "agt_reminders",
  "from": "+61352133262",
  "to": "+61412555018",
  "context": {
    "reason": "appointment reminder",
    "appointment": "Thursday 10:30am"
  }
}

Every call, as data.

Watch transcripts as they happen, then read the recording, summary and outcome from the API. Signed webhooks tell your app the moment anything changes.

Live transcript stream for any call
Recordings in private storage, per account
Summary, sentiment and action items
HMAC-signed webhooks you can verify

Webhook	Sent when
call.started	A call comes in or goes out
call.transfer_requested	The agent hands over
call.completed	Transcript and summary ready
call.recording_ready	The recording is saved

From sign-up to a live number in an afternoon.

Build the agent first, then put it on a real number and ring it.

1
Sign up and make a key
Create an account, then make an API key for your code or connect Claude to the MCP server.
2
Build the agent
Write the prompt and attach your tools from Claude, the API or the dashboard. Test it from the browser softphone.
3
Put it on a number
Search Australian numbers, buy one and route it to the agent. Then tune the prompt from real transcripts.

Everything a phone system does. Plus a brain.

Phone numbers
Search and buy Australian local numbers from the API, Claude or the dashboard.
AI voice agents
Claude in a natural Australian voice, running your prompt, tools and MCP servers.
Live transcription
Every call transcribed as it happens, whether the agent or a person answers.
Embeddable softphone
Calls from any browser or inside your own app, with hold, mute, a keypad and history.
Transfer and fallback
Ring people first and let the agent answer if nobody does, or the other way round.
Outbound AI calls
Reminders, confirmations and follow-ups, with context passed in from your app.

	Building it yourself	Fincall
Phone numbers	A carrier account and regulatory paperwork	Search and buy from the API
Speech	Separate speech-to-text and voice vendors	Built in, tuned for Australian English
The agent loop	Turn-taking, interruptions and tool calls you write	Claude with your tools and MCP servers
Transcripts and recordings	Storage and pipelines you build	On every call, in the API and webhooks
Softphone for people	A WebRTC client you build	One script tag
Managing it	An admin panel you build	Claude, the API or the dashboard

Bring your own MCP servers.

Give an agent the MCP servers you've already built, or plain HTTP tools, and it calls them mid-call. Your database, your billing system, your bookings: whatever your product already talks to.

// POST /api/agents
{
  "name": "Support line",
  "system_prompt": "You answer support calls for YourApp…",
  "greeting": "Thanks for calling YourApp.",
  "mcp_servers": [
    { "name": "accounts", "url": "https://mcp.yourapp.com" }
  ],
  "tools": [{
    "name": "get_account",
    "description": "Find a customer by phone number",
    "url": "https://api.yourapp.com/lookup",
    "input_schema": { "type": "object" }
  }],
  "keyterms": ["YourApp", "Pro plan"],
  "transfer_to": "+61400111222"
}

<script src="/embed.js"></script>
<script>
  Fincall.init({ token: getTokenFromYourBackend })
  Fincall.on('call.ended', (call) => {
    app.refreshCustomer(call)
  })
</script>

<button data-fincall-dial="0400 000 000">Call Jane</button>

A softphone in your own software.

One script tag puts the softphone inside your app, with click-to-call on any number. Your backend mints the embed token, and the REST API and signed webhooks cover numbers, agents, users and every call event.

Questions, answered.

Who is Fincall for?

People building AI products that need to make or take phone calls: developers, startups and teams adding a voice channel to software they already run. You get the phone system without building telephony, speech and transcription yourself.

What happens after I sign up?

You can build agents, make API keys and try the embedded softphone straight away. Your account starts pending, and numbers, outbound calls and softphone calling switch on once we've activated it.

How do I connect Claude?

Run claude mcp add --transport http fincall …/mcp --header "Authorization: Bearer fc_live_…" and Fincall's tools appear in Claude Code. In Claude, add the same /mcp URL as a custom connector and sign in to your Fincall account.

Can my agents use my own MCP servers?

Yes. Give an agent a list of MCP servers (URL plus optional token) and it calls their tools mid-call through Claude's MCP connector. HTTP tools work too.

How do webhooks work?

Set one webhook URL for your account. Every call event is posted to it with an X-Fincall-Signature header, an HMAC-SHA256 of the timestamp and body using your webhook secret, so you can check it came from Fincall.

Can I use a number I already have?

Yes. Forward it to a Fincall number, or use the Fincall number directly and move your existing number over later.

What does the AI agent sound like?

A natural Australian voice that speaks in short, conversational sentences. Call 03 5213 3261 to hear it.

Can callers still reach a real person?

Yes. The agent transfers to a person whenever the caller asks or the situation needs it. You can also ring people first and keep the agent as backup.

Where do recordings and transcripts go?

Each call is recorded, transcribed and summarised. Everything is available from the API and the dashboard and goes to your webhook. Recordings are kept in private storage, separated per account.

Who bills me?

Fincall is built by Chesterman Technologies. Your Fincall account is also a Kiewa account, Chesterman's customer and billing system, which handles invoices and support. If you're already a Kiewa customer, you can add Fincall to your plan.

The agentic phone system.

Build phone agents by talking to Claude.

What you can build on it.

A phone number for your product.

Calls that start from your code.

Agents and people on the same line.

Every call, as data.

From sign-up to a live number in an afternoon.

Sign up and make a key

Build the agent

Put it on a number

Everything a phone system does. Plus a brain.

Phone numbers

AI voice agents

Live transcription

Embeddable softphone

Transfer and fallback

Outbound AI calls

Wiring it up yourself vs Fincall.

Bring your own MCP servers.

A softphone in your own software.

Pay for what your agents use.

Questions, answered.

Hear it for yourself.