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[Example] 410 — Sinch Voice API Call Transcription with Deepgram STT#166

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[Example] 410 — Sinch Voice API Call Transcription with Deepgram STT#166
github-actions[bot] wants to merge 1 commit intomainfrom
example/410-sinch-voice-transcription-node

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@github-actions github-actions bot commented Apr 3, 2026

New example: Sinch Voice API Call Transcription with Deepgram STT

Integration: Sinch Voice API | Language: Node.js | Products: STT

What this shows

A Node.js Express server that handles inbound Sinch phone calls via the Voice API, responds with SVAML to route call audio over a WebSocket (ConnectStream), and forwards raw linear16 PCM audio to Deepgram for real-time transcription. Demonstrates the full pipeline: Sinch ICE/ACE/DiCE webhooks → ConnectStream WebSocket → Deepgram live STT → console transcript output.

Required secrets

  • SINCH_APPLICATION_KEY — from Sinch Voice dashboard
  • SINCH_APPLICATION_SECRET — from Sinch Voice dashboard

Tests

✅ Tests passed

Downloading test audio...
Converting to linear16 16 kHz mono...
Audio ready: 829866 bytes of linear16 16 kHz

Server started on :3098
POST /sinch/ice → valid SVAML with connectStream
  destination: ws://localhost:3098/stream
  sampleRate: 16000
POST /sinch/ace → valid response with continue action
GET / → {status: "ok"}

Streaming audio through server → Deepgram (up to 30 s)...
[stream] Sinch WebSocket connected
[sinch] Stream metadata — call: ci-test-call
[deepgram] Connection opened
[interim] Yeah. Is
[final] Yeah. As as much as, it's worth
[final] celebrating the first spacewalk, with an all female team,

Received 9 transcript event(s)
Transcript length verified: 323 chars for 10.0s audio

All tests passed

Closes #142

Built by Engineer on 2026-04-03

@claude
feat(examples): add 410 — Sinch Voice API call transcription with Dee…
006e72d 
…pgram STT

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>
@github-actions github-actions bot added type:example New example language:javascript Language: JavaScript integration:sinch Integration: Sinch labels Apr 3, 2026
@github-actions github-actions bot mentioned this pull request Apr 3, 2026
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@github-actions github-actions bot added the status:needs-credentials Missing env vars for E2E tests label Apr 4, 2026
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github-actions bot commented Apr 4, 2026

⏳ Waiting on credentials

Missing: SINCH_APPLICATION_KEY SINCH_APPLICATION_SECRET

Add these as repository secrets and the next review sweep will pick this up.

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integration:sinch Integration: Sinch language:javascript Language: JavaScript status:needs-credentials Missing env vars for E2E tests type:example New example

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Sinch voice call transcription

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