openclaw/extensions/voice-call

@openclaw/voice-call

Official Voice Call plugin for OpenClaw.

Providers:

• Twilio (Programmable Voice + Media Streams)
• Telnyx (Call Control v2)
• Plivo (Voice API + XML transfer + GetInput speech)
• Mock (dev/no network)

Docs: https://docs.openclaw.ai/plugins/voice-call Plugin system: https://docs.openclaw.ai/plugin

Install (local dev)

Option A: install via OpenClaw (recommended)

openclaw plugins install @openclaw/voice-call

Restart the Gateway afterwards.

Option B: copy into your global extensions folder (dev)

mkdir -p ~/.openclaw/extensions
cp -R extensions/voice-call ~/.openclaw/extensions/voice-call
cd ~/.openclaw/extensions/voice-call && pnpm install

Config

Put under plugins.entries.voice-call.config:

{
  provider: "twilio", // or "telnyx" | "plivo" | "mock"
  fromNumber: "+15550001234",
  toNumber: "+15550005678",

  twilio: {
    accountSid: "ACxxxxxxxx",
    authToken: "your_token",
  },

  plivo: {
    authId: "MAxxxxxxxxxxxxxxxxxxxx",
    authToken: "your_token",
  },

  // Webhook server
  serve: {
    port: 3334,
    path: "/voice/webhook",
  },

  // Public exposure (pick one):
  // publicUrl: "https://example.ngrok.app/voice/webhook",
  // tunnel: { provider: "ngrok" },
  // tailscale: { mode: "funnel", path: "/voice/webhook" }

  outbound: {
    defaultMode: "notify", // or "conversation"
  },

  streaming: {
    enabled: true,
    streamPath: "/voice/stream",
  },
}

Notes:

• Twilio/Telnyx/Plivo require a publicly reachable webhook URL.
• mock is a local dev provider (no network calls).
• tunnel.allowNgrokFreeTierLoopbackBypass: true allows Twilio webhooks with invalid signatures only when tunnel.provider="ngrok" and serve.bind is loopback (ngrok local agent). Use for local dev only.

TTS for calls

Voice Call uses the core messages.tts configuration (OpenAI or ElevenLabs) for streaming speech on calls. You can override it under the plugin config with the same shape — overrides deep-merge with messages.tts.

{
  tts: {
    provider: "openai",
    openai: {
      voice: "alloy",
    },
  },
}

Notes:

• Edge TTS is ignored for voice calls (telephony audio needs PCM; Edge output is unreliable).
• Core TTS is used when Twilio media streaming is enabled; otherwise calls fall back to provider native voices.

CLI

openclaw voicecall call --to "+15555550123" --message "Hello from OpenClaw"
openclaw voicecall continue --call-id <id> --message "Any questions?"
openclaw voicecall speak --call-id <id> --message "One moment"
openclaw voicecall end --call-id <id>
openclaw voicecall status --call-id <id>
openclaw voicecall tail
openclaw voicecall expose --mode funnel

Tool

Tool name: voice_call

Actions:

• initiate_call (message, to?, mode?)
• continue_call (callId, message)
• speak_to_user (callId, message)
• end_call (callId)
• get_status (callId)

Gateway RPC

• voicecall.initiate (to?, message, mode?)
• voicecall.continue (callId, message)
• voicecall.speak (callId, message)
• voicecall.end (callId)
• voicecall.status (callId)

Notes

• Uses webhook signature verification for Twilio/Telnyx/Plivo.
• responseModel / responseSystemPrompt control AI auto-responses.
• Media streaming requires ws and OpenAI Realtime API key.