@pllan/voice-call

Official Voice Call plugin for Pllan.

Providers:

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

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

Install (local dev)

Option A: install via Pllan (recommended)

pllan plugins install @pllan/voice-call

Restart the Gateway afterwards.

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

mkdir -p ~/.pllan/extensions
cp -R extensions/voice-call ~/.pllan/extensions/voice-call
cd ~/.pllan/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",
  },

  telnyx: {
    apiKey: "KEYxxxx",
    connectionId: "CONNxxxx",
    // Telnyx webhook public key from the Telnyx Mission Control Portal
    // (Base64 string; can also be set via TELNYX_PUBLIC_KEY).
    publicKey: "...",
  },

  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",
    preStartTimeoutMs: 5000,
    maxPendingConnections: 32,
    maxPendingConnectionsPerIp: 4,
    maxConnections: 128,
  },
}

Notes:

• Twilio/Telnyx/Plivo require a publicly reachable webhook URL.
• mock is a local dev provider (no network calls).
• Telnyx requires telnyx.publicKey (or TELNYX_PUBLIC_KEY) unless skipSignatureVerification is true.
• advanced webhook, streaming, and tunnel notes: https://docs.pllan.ai/plugins/voice-call

Stale call reaper

See the plugin docs for recommended ranges and production examples: https://docs.pllan.ai/plugins/voice-call#stale-call-reaper

TTS for calls

Voice Call uses the core messages.tts configuration for streaming speech on calls. Override examples and provider caveats live here: https://docs.pllan.ai/plugins/voice-call#tts-for-calls

CLI

pllan voicecall call --to "+15555550123" --message "Hello from Pllan"
pllan voicecall continue --call-id <id> --message "Any questions?"
pllan voicecall speak --call-id <id> --message "One moment"
pllan voicecall end --call-id <id>
pllan voicecall status --call-id <id>
pllan voicecall tail
pllan 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.
• Adds replay protection for Twilio and Plivo webhooks (valid duplicate callbacks are ignored safely).
• Twilio speech turns include a per-turn token so stale/replayed callbacks cannot complete a newer turn.
• responseModel / responseSystemPrompt control AI auto-responses.
• Media streaming requires ws and OpenAI Realtime API key.