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Voice Call (plugin)

Voice calls for Moltbot via a plugin. Supports outbound notifications and multi-turn conversations with inbound policies. Current providers:
  • twilio (Programmable Voice + Media Streams)
  • telnyx (Call Control v2)
  • plivo (Voice API + XML transfer + GetInput speech)
  • mock (dev/no network)
Quick mental model:
  • Install plugin
  • Restart Gateway
  • Configure under plugins.entries.voice-call.config
  • Use moltbot voicecall ... or the voice_call tool

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Where it runs (local vs remote)

The Voice Call plugin runs inside the Gateway process. If you use a remote Gateway, install/configure the plugin on the machine running the Gateway, then restart the Gateway to load it.

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Install

moltbot plugins install @moltbot/voice-call
Restart the Gateway afterwards.

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Option B: install from a local folder (dev, no copying)

moltbot plugins install ./extensions/voice-call
cd ./extensions/voice-call && pnpm install
Restart the Gateway afterwards.

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Config

Set config under plugins.entries.voice-call.config: 
{
  plugins: {
    entries: {
      "voice-call": {
        enabled: true,
        config: {
          provider: "twilio", // or "telnyx" | "plivo" | "mock"
          fromNumber: "+15550001234",
          toNumber: "+15550005678",

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

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

          // 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" // notify | conversation
          },

          streaming: {
            enabled: true,
            streamPath: "/voice/stream"
          }
        }
      }
    }
  }
}
Notes:
  • Twilio/Telnyx require a publicly reachable webhook URL.
  • Plivo requires a publicly reachable webhook URL.
  • mock is a local dev provider (no network calls).
  • skipSignatureVerification is for local testing only.
  • If you use ngrok free tier, set publicUrl to the exact ngrok URL; signature verification is always enforced.
  • 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.
  • Ngrok free tier URLs can change or add interstitial behavior; if publicUrl drifts, Twilio signatures will fail. For production, prefer a stable domain or Tailscale funnel.

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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 — it deep‑merges with messages.tts. 
{
  tts: {
    provider: "elevenlabs",
    elevenlabs: {
      voiceId: "pMsXgVXv3BLzUgSXRplE",
      modelId: "eleven_multilingual_v2"
    }
  }
}
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.

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More examples

Use core TTS only (no override): 
{
  messages: {
    tts: {
      provider: "openai",
      openai: { voice: "alloy" }
    }
  }
}
Override to ElevenLabs just for calls (keep core default elsewhere): 
{
  plugins: {
    entries: {
      "voice-call": {
        config: {
          tts: {
            provider: "elevenlabs",
            elevenlabs: {
              apiKey: "elevenlabs_key",
              voiceId: "pMsXgVXv3BLzUgSXRplE",
              modelId: "eleven_multilingual_v2"
            }
          }
        }
      }
    }
  }
}
Override only the OpenAI model for calls (deep‑merge example): 
{
  plugins: {
    entries: {
      "voice-call": {
        config: {
          tts: {
            openai: {
              model: "gpt-4o-mini-tts",
              voice: "marin"
            }
          }
        }
      }
    }
  }
}

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Inbound calls

Inbound policy defaults to disabled. To enable inbound calls, set: 
{
  inboundPolicy: "allowlist",
  allowFrom: ["+15550001234"],
  inboundGreeting: "Hello! How can I help?"
}
Auto-responses use the agent system. Tune with:
  • responseModel
  • responseSystemPrompt
  • responseTimeoutMs

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CLI

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

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Agent 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)
This repo ships a matching skill doc at skills/voice-call/SKILL.md.

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Gateway RPC

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