> ## Documentation Index
> Fetch the complete documentation index at: https://docs.sayvyai.com/llms.txt
> Use this file to discover all available pages before exploring further.

# WhatsApp Calls

> Inbound and outbound WhatsApp audio calls and voice notes

# WhatsApp Calls

*This page covers the technical implementation for handling WhatsApp voice interactions and audio streams.*

***

## WhatsApp Audio Architecture

*Content coming soon.*

* Meta Cloud API voice note and audio stream integration
* Audio container specifications (`audio/ogg; codecs=opus`)
* Inbound vs. Outbound calling flows

***

## Inbound Audio Ingestion & Transcoding

*Content coming soon.*

* Receiving audio payload URLs via Meta webhooks
* Stream downloading and Opus-to-PCM normalization for STT
* Voice note transcription and intent recognition

***

## Outbound Audio Response Synthesis

*Content coming soon.*

* Transcoding neural TTS output into WhatsApp-compatible Opus containers
* Media upload to Meta Graph API
* Dispatching outbound voice messages and interactive audio responses


This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.