Step-by-step guides to connect WhatsApp to Claude, ChatGPT, Cursor, Grok and your PBX, plus the engineering behind it: SIP bridging, the MLow voice codec, webhooks and per-number egress.
Connect your official WhatsApp Business API number to ChatGPT with WhatsMCP: Embedded Signup, Developer mode, templates and the 24-hour window.
Put your official WhatsApp Business API number in Claude: Embedded Signup, one MCP URL, templates and Meta's 24-hour window handled for you.
Connect WhatsApp to Claude Code, Claude Desktop and claude.ai with WhatsMCP: one MCP URL, OAuth sign-in, 45 tools. Setup, prompts and FAQ.
The pjsip.conf settings that matter for the WhatsMCP bridge: G.722/G.711 codec order, endpoint vs trunk, NAT, one call per number, and what doesn't cross.
Connect WhatsApp to ChatGPT with WhatsMCP: turn on Developer mode, add one MCP URL, sign in with OAuth. Read, reply and manage groups from ChatGPT.
Connect WhatsApp to Grok with WhatsMCP: a custom connector on grok.com, or the xAI API's remote MCP tool. Setup, code samples, prompts and FAQ.
How WhatsApp Business API templates work: categories, variables, limits, common rejection reasons, 10 examples, and sending them from an AI agent.
Personal WhatsApp or the WhatsApp Business API for your AI agent? Features, rules, costs and setup compared, with a simple way to choose.
Connect WhatsApp to OpenAI Codex with WhatsMCP: codex mcp add and login, or config.toml with an env-var API key. Setup, prompts and FAQ.
Connect WhatsApp to Cursor's agent with WhatsMCP: add one entry to mcp.json, sign in with OAuth or an env-var API key, and build against a real number.
A builder's field guide to Model Context Protocol servers in 2026: shaping tools as an agent UI, escaping the context tax with code execution, defending against tool poisoning, and living with the new stateless spec.
How we built a clean-room, pure-Go encoder and decoder for MLow — Meta's low-bitrate codec behind billions of WhatsApp, Messenger and Instagram calls: the hybrid SILK/CELT structure, reverse-engineering it against the live library, and frame-exact validation.
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