What is Patter?
Open-source voice-AI SDK. The Vapi/Retell alternative for builders who want to own the stack. Give your AI agent a phone number in 4 lines — Python and TypeScript, MIT licensed, Twilio, Telnyx, and Plivo.
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Availability and pricing verified on 21 Sept 2026 from the official source. Official page: Patter — Give your AI agent a phone number.
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