---
summary: "Place outbound and accept inbound voice calls via Twilio, Telnyx, or Plivo, with optional realtime voice and streaming transcription"
read_when:
  - You want to place an outbound voice call from OpenClaw
  - You are configuring or developing the voice-call plugin
  - You need realtime voice or streaming transcription on telephony
title: "Voice call plugin"
sidebarTitle: "Voice call"
---

Voice calls for OpenClaw via a plugin. Supports outbound notifications,
multi-turn conversations, full-duplex realtime voice, streaming
transcription, and inbound calls with allowlist policies.

**Current providers:** `twilio` (Programmable Voice + Media Streams),
`telnyx` (Call Control v2), `plivo` (Voice API + XML transfer + GetInput
speech), `mock` (dev/no network).

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

## Quick start

<Steps>
  <Step title="Install the plugin">
    <Tabs>
      <Tab title="From npm">
        ```bash
        openclaw plugins install @openclaw/voice-call
        ```
      </Tab>
      <Tab title="From a local folder (dev)">
        ```bash
        PLUGIN_SRC=./path/to/local/voice-call-plugin
        openclaw plugins install "$PLUGIN_SRC"
        cd "$PLUGIN_SRC" && pnpm install
        ```
      </Tab>
    </Tabs>

    Use the bare package to follow the current official release tag. Pin an
    exact version only when you need a reproducible install.

    Restart the Gateway afterwards so the plugin loads.

  </Step>
  <Step title="Configure provider and webhook">
    Set config under `plugins.entries.voice-call.config` (see
    [Configuration](#configuration) below for the full shape). At minimum:
    `provider`, provider credentials, `fromNumber`, and a publicly
    reachable webhook URL.
  </Step>
  <Step title="Verify setup">
    ```bash
    openclaw voicecall setup
    ```

    The default output is readable in chat logs and terminals. It checks
    plugin enablement, provider credentials, webhook exposure, and that
    only one audio mode (`streaming` or `realtime`) is active. Use
    `--json` for scripts.

  </Step>
  <Step title="Smoke test">
    ```bash
    openclaw voicecall smoke
    openclaw voicecall smoke --to "+15555550123"
    ```

    Both are dry runs by default. Add `--yes` to actually place a short
    outbound notify call:

    ```bash
    openclaw voicecall smoke --to "+15555550123" --yes
    ```

  </Step>
</Steps>

<Warning>
For Twilio, Telnyx, and Plivo, setup must resolve to a **public webhook URL**.
If `publicUrl`, the tunnel URL, the Tailscale URL, or the serve fallback
resolves to loopback or private network space, setup fails instead of
starting a provider that cannot receive carrier webhooks.
</Warning>

## Configuration

If `enabled: true` but the selected provider is missing credentials,
Gateway startup logs a setup-incomplete warning with the missing keys and
skips starting the runtime. Commands, RPC calls, and agent tools still
return the exact missing provider configuration when used.

<Note>
Voice-call credentials accept SecretRefs. `plugins.entries.voice-call.config.twilio.authToken`, `plugins.entries.voice-call.config.realtime.providers.*.apiKey`, `plugins.entries.voice-call.config.streaming.providers.*.apiKey`, and `plugins.entries.voice-call.config.tts.providers.*.apiKey` resolve through the standard SecretRef surface; see [SecretRef credential surface](/reference/secretref-credential-surface).
</Note>

```json5
{
  plugins: {
    entries: {
      "voice-call": {
        enabled: true,
        config: {
          provider: "twilio", // or "telnyx" | "plivo" | "mock"
          fromNumber: "+15550001234", // or TWILIO_FROM_NUMBER for Twilio
          toNumber: "+15550005678",
          sessionScope: "per-phone", // per-phone | per-call
          numbers: {
            "+15550009999": {
              inboundGreeting: "Silver Fox Cards, how can I help?",
              responseSystemPrompt: "You are a concise baseball card specialist.",
              tts: {
                providers: {
                  openai: { voice: "alloy" },
                },
              },
            },
          },

          twilio: {
            accountSid: "ACxxxxxxxx",
            authToken: "...",
          },
          telnyx: {
            apiKey: "...",
            connectionId: "...",
            // Telnyx webhook public key from the Mission Control Portal
            // (Base64; can also be set via TELNYX_PUBLIC_KEY).
            publicKey: "...",
          },
          plivo: {
            authId: "MAxxxxxxxxxxxxxxxxxxxx",
            authToken: "...",
          },

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

          // Webhook security (recommended for tunnels/proxies)
          webhookSecurity: {
            allowedHosts: ["voice.example.com"],
            trustedProxyIPs: ["100.64.0.1"],
          },

          // 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 /* see Streaming transcription */ },
          realtime: { enabled: false /* see Realtime voice */ },
        },
      },
    },
  },
}
```

<AccordionGroup>
  <Accordion title="Provider exposure and security notes">
    - Twilio, Telnyx, and Plivo all 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.
    - `skipSignatureVerification` is for local testing only.
    - On 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). Local dev only.
    - Ngrok free-tier URLs can change or add interstitial behaviour; if `publicUrl` drifts, Twilio signatures fail. Production: prefer a stable domain or a Tailscale funnel.

  </Accordion>
  <Accordion title="Streaming connection caps">
    - `streaming.preStartTimeoutMs` closes sockets that never send a valid `start` frame.
    - `streaming.maxPendingConnections` caps total unauthenticated pre-start sockets.
    - `streaming.maxPendingConnectionsPerIp` caps unauthenticated pre-start sockets per source IP.
    - `streaming.maxConnections` caps total open media stream sockets (pending + active).

  </Accordion>
  <Accordion title="Legacy config migrations">
    Older configs using `provider: "log"`, `twilio.from`, or legacy
    `streaming.*` OpenAI keys are rewritten by `openclaw doctor --fix`.
    Runtime fallback still accepts the old voice-call keys for now, but
    the rewrite path is `openclaw doctor --fix` and the compat shim is
    temporary.

    Auto-migrated streaming keys:

    - `streaming.sttProvider` → `streaming.provider`
    - `streaming.openaiApiKey` → `streaming.providers.openai.apiKey`
    - `streaming.sttModel` → `streaming.providers.openai.model`
    - `streaming.silenceDurationMs` → `streaming.providers.openai.silenceDurationMs`
    - `streaming.vadThreshold` → `streaming.providers.openai.vadThreshold`

  </Accordion>
</AccordionGroup>

## Session scope

By default, Voice Call uses `sessionScope: "per-phone"` so repeat calls from
the same caller keep conversation memory. Set `sessionScope: "per-call"` when
each carrier call should start with fresh context, for example reception,
booking, IVR, or Google Meet bridge flows where the same phone number may
represent different meetings.

## Realtime voice conversations

`realtime` selects a full-duplex realtime voice provider for live call
audio. It is separate from `streaming`, which only forwards audio to
realtime transcription providers.

<Warning>
`realtime.enabled` cannot be combined with `streaming.enabled`. Pick one
audio mode per call.
</Warning>

Current runtime behaviour:

- `realtime.enabled` is supported for Twilio Media Streams.
- `realtime.provider` is optional. If unset, Voice Call uses the first registered realtime voice provider.
- Bundled realtime voice providers: Google Gemini Live (`google`) and OpenAI (`openai`), registered by their provider plugins.
- Provider-owned raw config lives under `realtime.providers.<providerId>`.
- Voice Call exposes the shared `openclaw_agent_consult` realtime tool by default. The realtime model can call it when the caller asks for deeper reasoning, current information, or normal OpenClaw tools.
- `realtime.fastContext.enabled` is default-off. When enabled, Voice Call first searches indexed memory/session context for the consult question and returns those snippets to the realtime model within `realtime.fastContext.timeoutMs` before falling back to the full consult agent only if `realtime.fastContext.fallbackToConsult` is true.
- If `realtime.provider` points at an unregistered provider, or no realtime voice provider is registered at all, Voice Call logs a warning and skips realtime media instead of failing the whole plugin.
- Consult session keys reuse the stored call session when available, then fall back to the configured `sessionScope` (`per-phone` by default, or `per-call` for isolated calls).

### Tool policy

`realtime.toolPolicy` controls the consult run:

| Policy           | Behavior                                                                                                                                 |
| ---------------- | ---------------------------------------------------------------------------------------------------------------------------------------- |
| `safe-read-only` | Expose the consult tool and limit the regular agent to `read`, `web_search`, `web_fetch`, `x_search`, `memory_search`, and `memory_get`. |
| `owner`          | Expose the consult tool and let the regular agent use the normal agent tool policy.                                                      |
| `none`           | Do not expose the consult tool. Custom `realtime.tools` are still passed through to the realtime provider.                               |

### Realtime provider examples

<Tabs>
  <Tab title="Google Gemini Live">
    Defaults: API key from `realtime.providers.google.apiKey`,
    `GEMINI_API_KEY`, or `GOOGLE_GENERATIVE_AI_API_KEY`; model
    `gemini-2.5-flash-native-audio-preview-12-2025`; voice `Kore`.

    ```json5
    {
      plugins: {
        entries: {
          "voice-call": {
            config: {
              provider: "twilio",
              inboundPolicy: "allowlist",
              allowFrom: ["+15550005678"],
              realtime: {
                enabled: true,
                provider: "google",
                instructions: "Speak briefly. Call openclaw_agent_consult before using deeper tools.",
                toolPolicy: "safe-read-only",
                providers: {
                  google: {
                    apiKey: "${GEMINI_API_KEY}",
                    model: "gemini-2.5-flash-native-audio-preview-12-2025",
                    voice: "Kore",
                  },
                },
              },
            },
          },
        },
      },
    }
    ```

  </Tab>
  <Tab title="OpenAI">
    ```json5
    {
      plugins: {
        entries: {
          "voice-call": {
            config: {
              realtime: {
                enabled: true,
                provider: "openai",
                providers: {
                  openai: { apiKey: "${OPENAI_API_KEY}" },
                },
              },
            },
          },
        },
      },
    }
    ```
  </Tab>
</Tabs>

See [Google provider](/providers/google) and
[OpenAI provider](/providers/openai) for provider-specific realtime voice
options.

## Streaming transcription

`streaming` selects a realtime transcription provider for live call audio.

Current runtime behavior:

- `streaming.provider` is optional. If unset, Voice Call uses the first registered realtime transcription provider.
- Bundled realtime transcription providers: Deepgram (`deepgram`), ElevenLabs (`elevenlabs`), Mistral (`mistral`), OpenAI (`openai`), and xAI (`xai`), registered by their provider plugins.
- Provider-owned raw config lives under `streaming.providers.<providerId>`.
- After Twilio sends an accepted stream `start` message, Voice Call registers the stream immediately, queues inbound media through the transcription provider while the provider connects, and starts the initial greeting only after realtime transcription is ready.
- If `streaming.provider` points at an unregistered provider, or none is registered, Voice Call logs a warning and skips media streaming instead of failing the whole plugin.

### Streaming provider examples

<Tabs>
  <Tab title="OpenAI">
    Defaults: API key `streaming.providers.openai.apiKey` or
    `OPENAI_API_KEY`; model `gpt-4o-transcribe`; `silenceDurationMs: 800`;
    `vadThreshold: 0.5`.

    ```json5
    {
      plugins: {
        entries: {
          "voice-call": {
            config: {
              streaming: {
                enabled: true,
                provider: "openai",
                streamPath: "/voice/stream",
                providers: {
                  openai: {
                    apiKey: "sk-...", // optional if OPENAI_API_KEY is set
                    model: "gpt-4o-transcribe",
                    silenceDurationMs: 800,
                    vadThreshold: 0.5,
                  },
                },
              },
            },
          },
        },
      },
    }
    ```

  </Tab>
  <Tab title="xAI">
    Defaults: API key `streaming.providers.xai.apiKey` or `XAI_API_KEY`;
    endpoint `wss://api.x.ai/v1/stt`; encoding `mulaw`; sample rate `8000`;
    `endpointingMs: 800`; `interimResults: true`.

    ```json5
    {
      plugins: {
        entries: {
          "voice-call": {
            config: {
              streaming: {
                enabled: true,
                provider: "xai",
                streamPath: "/voice/stream",
                providers: {
                  xai: {
                    apiKey: "${XAI_API_KEY}", // optional if XAI_API_KEY is set
                    endpointingMs: 800,
                    language: "en",
                  },
                },
              },
            },
          },
        },
      },
    }
    ```

  </Tab>
</Tabs>

## TTS for calls

Voice Call uses the core `messages.tts` configuration for streaming
speech on calls. You can override it under the plugin config with the
**same shape** — it deep-merges with `messages.tts`.

```json5
{
  tts: {
    provider: "elevenlabs",
    providers: {
      elevenlabs: {
        voiceId: "pMsXgVXv3BLzUgSXRplE",
        modelId: "eleven_multilingual_v2",
      },
    },
  },
}
```

<Warning>
**Microsoft speech is ignored for voice calls.** Telephony audio needs PCM;
the current Microsoft transport does not expose telephony PCM output.
</Warning>

Behavior notes:

- Legacy `tts.<provider>` keys inside plugin config (`openai`, `elevenlabs`, `microsoft`, `edge`) are repaired by `openclaw doctor --fix`; committed config should use `tts.providers.<provider>`.
- Core TTS is used when Twilio media streaming is enabled; otherwise calls fall back to provider-native voices.
- If a Twilio media stream is already active, Voice Call does not fall back to TwiML `<Say>`. If telephony TTS is unavailable in that state, the playback request fails instead of mixing two playback paths.
- When telephony TTS falls back to a secondary provider, Voice Call logs a warning with the provider chain (`from`, `to`, `attempts`) for debugging.
- When Twilio barge-in or stream teardown clears the pending TTS queue, queued playback requests settle instead of hanging callers awaiting playback completion.

### TTS examples

<Tabs>
  <Tab title="Core TTS only">
```json5
{
  messages: {
    tts: {
      provider: "openai",
      providers: {
        openai: { voice: "alloy" },
      },
    },
  },
}
```
  </Tab>
  <Tab title="Override to ElevenLabs (calls only)">
```json5
{
  plugins: {
    entries: {
      "voice-call": {
        config: {
          tts: {
            provider: "elevenlabs",
            providers: {
              elevenlabs: {
                apiKey: "elevenlabs_key",
                voiceId: "pMsXgVXv3BLzUgSXRplE",
                modelId: "eleven_multilingual_v2",
              },
            },
          },
        },
      },
    },
  },
}
```
  </Tab>
  <Tab title="OpenAI model override (deep-merge)">
```json5
{
  plugins: {
    entries: {
      "voice-call": {
        config: {
          tts: {
            providers: {
              openai: {
                model: "gpt-4o-mini-tts",
                voice: "marin",
              },
            },
          },
        },
      },
    },
  },
}
```
  </Tab>
</Tabs>

## Inbound calls

Inbound policy defaults to `disabled`. To enable inbound calls, set:

```json5
{
  inboundPolicy: "allowlist",
  allowFrom: ["+15550001234"],
  inboundGreeting: "Hello! How can I help?",
}
```

<Warning>
`inboundPolicy: "allowlist"` is a low-assurance caller-ID screen. The
plugin normalizes the provider-supplied `From` value and compares it to
`allowFrom`. Webhook verification authenticates provider delivery and
payload integrity, but it does **not** prove PSTN/VoIP caller-number
ownership. Treat `allowFrom` as caller-ID filtering, not strong caller
identity.
</Warning>

Auto-responses use the agent system. Tune with `responseModel`,
`responseSystemPrompt`, and `responseTimeoutMs`.

### Per-number Routing

Use `numbers` when one Voice Call plugin receives calls for multiple phone
numbers and each number should behave like a different line. For example, one
number can use a casual personal assistant while another uses a business
persona, a different response agent, and a different TTS voice.

Routes are selected from the provider-supplied dialed `To` number. Keys must be
E.164 numbers. When a call arrives, Voice Call resolves the matching route once,
stores the matched route on the call record, and reuses that effective config
for the greeting, classic auto-response path, realtime consult path, and TTS
playback. If no route matches, the global Voice Call config is used.
Outbound calls do not use `numbers`; pass the outbound target, message, and
session explicitly when initiating the call.

Route overrides currently support:

- `inboundGreeting`
- `tts`
- `agentId`
- `responseModel`
- `responseSystemPrompt`
- `responseTimeoutMs`

The `tts` route value deep-merges over the global Voice Call `tts` config, so
you can usually override only the provider voice:

```json5
{
  inboundGreeting: "Hello from the main line.",
  responseSystemPrompt: "You are the default voice assistant.",
  tts: {
    provider: "openai",
    providers: {
      openai: { voice: "coral" },
    },
  },
  numbers: {
    "+15550001111": {
      inboundGreeting: "Silver Fox Cards, how can I help?",
      responseSystemPrompt: "You are a concise baseball card specialist.",
      tts: {
        providers: {
          openai: { voice: "alloy" },
        },
      },
    },
  },
}
```

### Spoken output contract

For auto-responses, Voice Call appends a strict spoken-output contract to
the system prompt:

```text
{"spoken":"..."}
```

Voice Call extracts speech text defensively:

- Ignores payloads marked as reasoning/error content.
- Parses direct JSON, fenced JSON, or inline `"spoken"` keys.
- Falls back to plain text and removes likely planning/meta lead-in paragraphs.

This keeps spoken playback focused on caller-facing text and avoids
leaking planning text into audio.

### Conversation startup behavior

For outbound `conversation` calls, first-message handling is tied to live
playback state:

- Barge-in queue clear and auto-response are suppressed only while the initial greeting is actively speaking.
- If initial playback fails, the call returns to `listening` and the initial message remains queued for retry.
- Initial playback for Twilio streaming starts on stream connect without extra delay.
- Barge-in aborts active playback and clears queued-but-not-yet-playing Twilio TTS entries. Cleared entries resolve as skipped, so follow-up response logic can continue without waiting on audio that will never play.
- Realtime voice conversations use the realtime stream's own opening turn. Voice Call does **not** post a legacy `<Say>` TwiML update for that initial message, so outbound `<Connect><Stream>` sessions stay attached.

### Twilio stream disconnect grace

When a Twilio media stream disconnects, Voice Call waits **2000 ms** before
auto-ending the call:

- If the stream reconnects during that window, auto-end is canceled.
- If no stream re-registers after the grace period, the call is ended to prevent stuck active calls.

## Stale call reaper

Use `staleCallReaperSeconds` to end calls that never receive a terminal
webhook (for example, notify-mode calls that never complete). The default
is `0` (disabled).

Recommended ranges:

- **Production:** `120`–`300` seconds for notify-style flows.
- Keep this value **higher than `maxDurationSeconds`** so normal calls can finish. A good starting point is `maxDurationSeconds + 30–60` seconds.

```json5
{
  plugins: {
    entries: {
      "voice-call": {
        config: {
          maxDurationSeconds: 300,
          staleCallReaperSeconds: 360,
        },
      },
    },
  },
}
```

## Webhook security

When a proxy or tunnel sits in front of the Gateway, the plugin
reconstructs the public URL for signature verification. These options
control which forwarded headers are trusted:

<ParamField path="webhookSecurity.allowedHosts" type="string[]">
  Allowlist hosts from forwarding headers.
</ParamField>
<ParamField path="webhookSecurity.trustForwardingHeaders" type="boolean">
  Trust forwarded headers without an allowlist.
</ParamField>
<ParamField path="webhookSecurity.trustedProxyIPs" type="string[]">
  Only trust forwarded headers when the request remote IP matches the list.
</ParamField>

Additional protections:

- Webhook **replay protection** is enabled for Twilio and Plivo. Replayed valid webhook requests are acknowledged but skipped for side effects.
- Twilio conversation turns include a per-turn token in `<Gather>` callbacks, so stale/replayed speech callbacks cannot satisfy a newer pending transcript turn.
- Unauthenticated webhook requests are rejected before body reads when the provider's required signature headers are missing.
- The voice-call webhook uses the shared pre-auth body profile (64 KB / 5 seconds) plus a per-IP in-flight cap before signature verification.

Example with a stable public host:

```json5
{
  plugins: {
    entries: {
      "voice-call": {
        config: {
          publicUrl: "https://voice.example.com/voice/webhook",
          webhookSecurity: {
            allowedHosts: ["voice.example.com"],
          },
        },
      },
    },
  },
}
```

## CLI

```bash
openclaw voicecall call --to "+15555550123" --message "Hello from OpenClaw"
openclaw voicecall start --to "+15555550123"   # alias for call
openclaw voicecall continue --call-id <id> --message "Any questions?"
openclaw voicecall speak --call-id <id> --message "One moment"
openclaw voicecall dtmf --call-id <id> --digits "ww123456#"
openclaw voicecall end --call-id <id>
openclaw voicecall status --call-id <id>
openclaw voicecall tail
openclaw voicecall latency                      # summarize turn latency from logs
openclaw voicecall expose --mode funnel
```

When the Gateway is already running, operational `voicecall` commands delegate
to the Gateway-owned voice-call runtime so the CLI does not bind a second
webhook server. If no Gateway is reachable, the commands fall back to a
standalone CLI runtime.

`latency` reads `calls.jsonl` from the default voice-call storage path.
Use `--file <path>` to point at a different log and `--last <n>` to limit
analysis to the last N records (default 200). Output includes p50/p90/p99
for turn latency and listen-wait times.

## Agent tool

Tool name: `voice_call`.

| Action          | Args                                       |
| --------------- | ------------------------------------------ |
| `initiate_call` | `message`, `to?`, `mode?`, `dtmfSequence?` |
| `continue_call` | `callId`, `message`                        |
| `speak_to_user` | `callId`, `message`                        |
| `send_dtmf`     | `callId`, `digits`                         |
| `end_call`      | `callId`                                   |
| `get_status`    | `callId`                                   |

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

## Gateway RPC

| Method               | Args                                       |
| -------------------- | ------------------------------------------ |
| `voicecall.initiate` | `to?`, `message`, `mode?`, `dtmfSequence?` |
| `voicecall.continue` | `callId`, `message`                        |
| `voicecall.speak`    | `callId`, `message`                        |
| `voicecall.dtmf`     | `callId`, `digits`                         |
| `voicecall.end`      | `callId`                                   |
| `voicecall.status`   | `callId`                                   |

`dtmfSequence` is only valid with `mode: "conversation"`. Notify-mode calls
should use `voicecall.dtmf` after the call exists if they need post-connect
digits.

## Troubleshooting

### Setup fails webhook exposure

Run setup from the same environment that runs the Gateway:

```bash
openclaw voicecall setup
openclaw voicecall setup --json
```

For `twilio`, `telnyx`, and `plivo`, `webhook-exposure` must be green. A
configured `publicUrl` still fails when it points at local or private network
space, because the carrier cannot call back into those addresses. Do not use
`localhost`, `127.0.0.1`, `0.0.0.0`, `10.x`, `172.16.x`-`172.31.x`,
`192.168.x`, `169.254.x`, `fc00::/7`, or `fd00::/8` as `publicUrl`.

Twilio notify-mode outbound calls send their initial `<Say>` TwiML directly in
the create-call request, so the first spoken message does not depend on Twilio
fetching webhook TwiML. A public webhook is still required for status callbacks,
conversation calls, pre-connect DTMF, realtime streams, and post-connect call
control.

Use one public exposure path:

```json5
{
  plugins: {
    entries: {
      "voice-call": {
        config: {
          publicUrl: "https://voice.example.com/voice/webhook",
          // or
          tunnel: { provider: "ngrok" },
          // or
          tailscale: { mode: "funnel", path: "/voice/webhook" },
        },
      },
    },
  },
}
```

After changing config, restart or reload the Gateway, then run:

```bash
openclaw voicecall setup
openclaw voicecall smoke
```

`voicecall smoke` is a dry run unless you pass `--yes`.

### Provider credentials fail

Check the selected provider and the required credential fields:

- Twilio: `twilio.accountSid`, `twilio.authToken`, and `fromNumber`, or
  `TWILIO_ACCOUNT_SID`, `TWILIO_AUTH_TOKEN`, and `TWILIO_FROM_NUMBER`.
- Telnyx: `telnyx.apiKey`, `telnyx.connectionId`, `telnyx.publicKey`, and
  `fromNumber`.
- Plivo: `plivo.authId`, `plivo.authToken`, and `fromNumber`.

Credentials must exist on the Gateway host. Editing a local shell profile does
not affect an already running Gateway until it restarts or reloads its
environment.

### Calls start but provider webhooks do not arrive

Confirm the provider console points at the exact public webhook URL:

```text
https://voice.example.com/voice/webhook
```

Then inspect runtime state:

```bash
openclaw voicecall status --call-id <id>
openclaw voicecall tail
openclaw logs --follow
```

Common causes:

- `publicUrl` points at a different path than `serve.path`.
- The tunnel URL changed after the Gateway started.
- A proxy forwards the request but strips or rewrites host/proto headers.
- Firewall or DNS routes the public hostname somewhere other than the Gateway.
- The Gateway was restarted without the Voice Call plugin enabled.

When a reverse proxy or tunnel is in front of the Gateway, set
`webhookSecurity.allowedHosts` to the public hostname, or use
`webhookSecurity.trustedProxyIPs` for a known proxy address. Use
`webhookSecurity.trustForwardingHeaders` only when the proxy boundary is under
your control.

### Signature verification fails

Provider signatures are checked against the public URL OpenClaw reconstructs
from the incoming request. If signatures fail:

- Confirm the provider webhook URL exactly matches `publicUrl`, including
  scheme, host, and path.
- For ngrok free-tier URLs, update `publicUrl` when the tunnel hostname changes.
- Ensure the proxy preserves the original host and proto headers, or configure
  `webhookSecurity.allowedHosts`.
- Do not enable `skipSignatureVerification` outside local testing.

### Google Meet Twilio joins fail

Google Meet uses this plugin for Twilio dial-in joins. First verify Voice Call:

```bash
openclaw voicecall setup
openclaw voicecall smoke --to "+15555550123"
```

Then verify the Google Meet transport explicitly:

```bash
openclaw googlemeet setup --transport twilio
```

If Voice Call is green but the Meet participant never joins, check the Meet
dial-in number, PIN, and `--dtmf-sequence`. The phone call can be healthy while
the meeting rejects or ignores an incorrect DTMF sequence.

Google Meet passes the Meet DTMF sequence and intro text to `voicecall.start`.
For Twilio calls, Voice Call serves the DTMF TwiML first, redirects back to the
webhook, then opens the realtime media stream so the saved intro is generated
after the phone participant has joined the meeting.

Use `openclaw logs --follow` for the live phase trace. A healthy Twilio Meet
join logs this order:

- Google Meet delegates the Twilio join to Voice Call.
- Voice Call stores pre-connect DTMF TwiML.
- Twilio initial TwiML is consumed and served before realtime handling.
- Voice Call serves realtime TwiML for the Twilio call.
- The realtime bridge starts with the initial greeting queued.

`openclaw voicecall tail` still shows persisted call records; it is useful for
call state and transcripts, but not every webhook/realtime transition appears
there.

### Realtime call has no speech

Confirm only one audio mode is enabled. `realtime.enabled` and
`streaming.enabled` cannot both be true.

For realtime Twilio calls, also verify:

- A realtime provider plugin is loaded and registered.
- `realtime.provider` is unset or names a registered provider.
- The provider API key is available to the Gateway process.
- `openclaw logs --follow` shows realtime TwiML served, the realtime bridge
  started, and the initial greeting queued.

## Related

- [Talk mode](/nodes/talk)
- [Text-to-speech](/tools/tts)
- [Voice wake](/nodes/voicewake)
