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.
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.
How WhatsApp Business API templates work: categories, variables, limits, common rejection reasons, 10 examples, and sending them from an AI agent.
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