Queue: Twilio Voice Agent telephony integration (Node.js)

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Integration: Twilio Voice + Deepgram Voice Agent API

Origin

Requested in #26: "A Node.js application that connects Twilio Voice (inbound and outbound calls) to Deepgram's Voice Agent API, enabling developers to build AI-powered phone agents that can answer calls, transcribe speech in real-time, and respond with Deepgram TTS."

What this should show

• Express server with Twilio webhook endpoints and WebSocket bridge to Deepgram Voice Agent API
• Inbound call handling: Twilio MediaStream → Deepgram Agent WebSocket (bidirectional)
• Outbound call initiation via Twilio REST API
• Audio format conversion between Twilio mulaw 8kHz and Deepgram linear16
• Agent TTS audio streamed back to the caller through Twilio MediaStream
• At least one function call / tool use within the voice agent (e.g., order status lookup)
• Clean WebSocket lifecycle management (connect, stream, disconnect)

Note on existing example

020-twilio-media-streams-node covers STT-only transcription. This example should focus on the Voice Agent API for full bidirectional conversational AI over the phone.

Credentials likely needed

• DEEPGRAM_API_KEY
• TWILIO_ACCOUNT_SID
• TWILIO_AUTH_TOKEN
• TWILIO_PHONE_NUMBER

Reference

• Deepgram Voice Agent API docs
• Twilio Media Streams docs
• Original issue: [Suggestion] Twilio Voice + Deepgram voice agent telephony integration (Node.js) #26

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Queued by PM from #26 on 2026-03-29

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Built in #104