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feat: add WhatsApp integration guide (DEVREL-586)#985

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feat: add WhatsApp integration guide (DEVREL-586)#985
vapi-tasker[bot] wants to merge 1 commit intomainfrom
tasker/DEVREL-586-whatsapp-integration-guide

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@vapi-tasker vapi-tasker bot commented Mar 21, 2026

Description

  • Add comprehensive WhatsApp integration guide at fern/advanced/sip/sip-whatsapp.mdx covering two approaches: voice calls via SIP trunking and text chat via the Chat API
  • Voice via SIP section includes three major steps: configuring the WhatsApp Business phone number on Meta's platform, configuring SIP settings on Meta's side, and creating a SIP trunk in Vapi with curl examples for each API call
  • Text chat section provides a three-step walkthrough for bridging WhatsApp messages to Vapi's Chat API
  • Includes prerequisites, limitations (US outbound call restriction), troubleshooting accordion with four common issues, and next steps with links to related docs
  • Add WhatsApp navigation entry in fern/docs.yml under SIP integration > Providers (after Plivo)
  • Addresses DEVREL-586, originated from the community question "how to connect Vapi to WhatsApp"

Testing Steps

  • Run the app locally using fern docs dev or navigate to preview deployment
  • Ensure that the changed pages and code snippets work
  • Navigate to Advanced > SIP integration > Providers > WhatsApp and verify the page renders correctly
  • Verify all Fern components render properly: Steps/Step, Warning, Note, AccordionGroup/Accordion
  • Verify all internal links resolve: /chat/quickstart, /advanced/sip/sip-trunk, /api-reference/calls/create, /call-forwarding, /advanced/sip/sip-networking
  • Verify all external Meta documentation links are accessible

Add comprehensive documentation for connecting WhatsApp with Vapi,
covering two approaches: voice calls via SIP trunking through Meta's
WhatsApp Business Calling API, and text chat via Vapi's Chat API.

The guide includes step-by-step setup instructions for Meta's platform,
SIP trunk configuration in Vapi, troubleshooting tips, and known
limitations (including no outbound calls in the US).

Addresses DEVREL-586.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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