LobbyStack

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Voice AI agent that answers business calls, books appointments and transfers urgent calls

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LobbyStack Overview

LobbyStack is the open-source AI receptionist for small business. It answers every call or only the ones your team misses. During the call it books, moves and cancels appointments, answers from your website, PDFs and FAQs, and transfers urgent calls to the right person. You set its behavior with plain-language rules. Calls run on OpenAI GPT-Live and open in 15 languages. Bookings can sync with Google Calendar, Cal.com or Calendly. Other agents can work with it too: its MCP server lets Claude or ChatGPT read calls and book appointments. The code is MIT-licensed.

How to evaluate LobbyStack for voice ai agents workflows

LobbyStack is listed as a freemium voice ai agents AI agent with open source access. Use this page to compare its core capabilities, practical use cases, pricing model, and alternatives before adding it to your workflow.

A strong first-fit use case is Plumbing and HVAC companies catching emergency calls at night and on weekends, especially if your team is shortlisting voice ai agents tools for a specific operational need.

Best-fit checks before choosing:

Confirm that freemium pricing matches your expected usage volume.
Compare LobbyStack with similar voice ai agents AI agents in the alternatives section.
Validate the key capability: Answers every call, or only after-hours and overflow calls.