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szerintedmi/callsitter

An AI phone assistant that answers calls for its owner, wastes scammers' time, declines sales calls, and takes messages from real callers.

Open-source alternative to:Google Call Screen

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3 days ago

What is it?

CallSitter answers the owner's phone when calls are diverted to a Telnyx number. An OpenAI realtime agent handles the conversation, while a classifier called TypeSafe Jev scores the growing transcript for scam, spam and genuine intent. A YAML-driven call flow then steers the agent: it wastes time on scammers, politely declines sales calls and asks to be removed from lists, or takes a message from genuine callers.

A second model, GPT-6 Luna, works for the owner rather than the caller. It writes rolling summaries, open questions and suggested replies, and produces an end-of-call summary. The owner follows each call through a single Telegram status message that updates as the call progresses, and can steer the agent by replying, using stage buttons, or taking over the call directly through a browser page.

The project also tracks per-call costs from vendor-reported usage and enforces spend, concurrency and per-caller limits. Recordings are published on a public site, and the code is Apache-2.0 licensed, though the call recordings in the demos folder are not.

Key features

  • 01Answers diverted calls with an OpenAI realtime voice agent via Telnyx.
  • 02Classifies calls as scam, spam or genuine and steers the agent accordingly.
  • 03Takes messages from genuine callers and includes them in the call summary.
  • 04Sends a single Telegram status message per call, updated live.
  • 05Lets the owner steer the agent or take over the call from Telegram or a browser.
  • 06Tracks per-call costs and enforces spend, concurrency and call limits.

Use cases

  • Wasting the time of automated scam callers without answering personally.
  • Politely declining sales and robocalls on a personal number.
  • Capturing messages from legitimate callers while away from the phone.
  • Studying how an AI call screener is built from classification, call flow and live steering.

Quick start

  1. 1

    Install dependencies with Bun

    bun install
  2. 2

    Create your .env file and fill in your API keys

    cp .env.example .env
  3. 3

    Start the dev server and open the admin UI

    bun run dev

Things to know

  • Running it for real calls needs accounts and keys for several vendors, including Telnyx, OpenAI, Telegram and a Cloudflare tunnel.
  • Setup is self-hosted and involves telephony and tunnel configuration, which takes real effort.
  • Call costs are billed by the vendors, and the README describes a spending cap that you must configure.

Topics

#voice-ai#telephony#llm#telegram#openai#call-screening#sip

FAQ

What is callsitter?
An AI phone assistant that answers calls for its owner, wastes scammers' time, declines sales calls, and takes messages from real callers. CallSitter answers the owner's phone when calls are diverted to a Telnyx number. An OpenAI realtime agent handles the conversation, while a classifier called TypeSafe Jev scores the growing transcript for scam, spam and genuine intent. A YAML-driven call flow then steers the agent: it wastes time on scammers, politely declines sales calls and asks to be removed from lists, or takes a message from genuine callers.
Is callsitter free to use? What license does it have?
callsitter is open source under the Apache-2.0 license. Check the license terms before using it in commercial products.
Is callsitter still maintained?
Actively maintained. The last commit to callsitter was on Oct 18, 2026.
What can I use callsitter for?
Wasting the time of automated scam callers without answering personally. Politely declining sales and robocalls on a personal number. Capturing messages from legitimate callers while away from the phone. Studying how an AI call screener is built from classification, call flow and live steering.
How do I install callsitter?
Install dependencies with Bun: bun install Create your .env file and fill in your API keys: cp .env.example .env Start the dev server and open the admin UI: bun run dev
Where can I get callsitter?
The source code and installation instructions are on GitHub: https://github.com/szerintedmi/callsitter

Summary generated by AI from the project's README. GitHub stats refresh daily.

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