---
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 Mnemo
  - 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 Mnemo 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
        mnemo plugins install @mnemo-bot/voice-call
        ```
      </Tab>
      <Tab title="From a local folder (dev)">
        ```bash
        PLUGIN_SRC=./path/to/local/voice-call-plugin
        mnemo 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
    mnemo 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
    mnemo voicecall smoke
    mnemo voicecall smoke --to "+15555550123"
    ```

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

    ```bash
    mnemo 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: { speakerVoice: "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 `mnemo doctor --fix`.
    Runtime fallback still accepts the old voice-call keys for now, but
    the rewrite path is `mnemo 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 `mnemo_agent_consult` realtime tool by default. The realtime model can call it when the caller asks for deeper reasoning, current information, or normal Mnemo tools.
- `realtime.consultPolicy` optionally adds guidance for when the realtime model should call `mnemo_agent_consult`.
- `realtime.agentContext.enabled` is default-off. When enabled, Voice Call injects a bounded agent identity and selected workspace-file capsule into the realtime provider instructions at session setup.
- `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.consultPolicy` controls only the realtime model instructions:

| Policy        | Guidance                                                                                        |
| ------------- | ----------------------------------------------------------------------------------------------- |
| `auto`        | Keep the default prompt and let the provider decide when to call the consult tool.              |
| `substantive` | Answer simple conversational glue directly and consult before facts, memory, tools, or context. |
| `always`      | Consult before every substantive answer.                                                        |

### Agent voice context

Enable `realtime.agentContext` when the voice bridge should sound like the
configured Mnemo agent without paying a full agent-consult round trip on
ordinary turns. The context capsule is added once when the realtime session is
created, so it does not add per-turn latency. Calls to
`mnemo_agent_consult` still run the full Mnemo agent and should be used
for tool work, current information, memory lookups, or workspace state.

```json5
{
  plugins: {
    entries: {
      "voice-call": {
        config: {
          agentId: "main",
          realtime: {
            enabled: true,
            provider: "google",
            toolPolicy: "safe-read-only",
            consultPolicy: "substantive",
            agentContext: {
              enabled: true,
              maxChars: 6000,
              includeIdentity: true,
              includeWorkspaceFiles: true,
              files: ["SOUL.md", "IDENTITY.md", "USER.md"],
            },
          },
        },
      },
    },
  },
}
```

### 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`.
    `sessionResumption` and `contextWindowCompression` default on for longer,
    reconnectable calls. Use `silenceDurationMs`, `startSensitivity`, and
    `endSensitivity` to tune faster turn-taking on telephony audio.

    ```json5
    {
      plugins: {
        entries: {
          "voice-call": {
            config: {
              provider: "twilio",
              inboundPolicy: "allowlist",
              allowFrom: ["+15550005678"],
              realtime: {
                enabled: true,
                provider: "google",
                instructions: "Speak briefly. Call mnemo_agent_consult before using deeper tools.",
                toolPolicy: "safe-read-only",
                consultPolicy: "substantive",
                consultThinkingLevel: "low",
                consultFastMode: true,
                agentContext: { enabled: true },
                providers: {
                  google: {
                    apiKey: "${GEMINI_API_KEY}",
                    model: "gemini-2.5-flash-native-audio-preview-12-2025",
                    speakerVoice: "Kore",
                    silenceDurationMs: 500,
                    startSensitivity: "high",
                  },
                },
              },
            },
          },
        },
      },
    }
    ```

  </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: {
        speakerVoiceId: "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 `mnemo 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: { speakerVoice: "alloy" },
      },
    },
  },
}
```
  </Tab>
  <Tab title="Override to ElevenLabs (calls only)">
```json5
{
  plugins: {
    entries: {
      "voice-call": {
        config: {
          tts: {
            provider: "elevenlabs",
            providers: {
              elevenlabs: {
                apiKey: "elevenlabs_key",
                speakerVoiceId: "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",
                speakerVoice: "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: { speakerVoice: "coral" },
    },
  },
  numbers: {
    "+15550001111": {
      inboundGreeting: "Silver Fox Cards, how can I help?",
      responseSystemPrompt: "You are a concise baseball card specialist.",
      tts: {
        providers: {
          openai: { speakerVoice: "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
mnemo voicecall call --to "+15555550123" --message "Hello from Mnemo"
mnemo voicecall start --to "+15555550123"   # alias for call
mnemo voicecall continue --call-id <id> --message "Any questions?"
mnemo voicecall speak --call-id <id> --message "One moment"
mnemo voicecall dtmf --call-id <id> --digits "ww123456#"
mnemo voicecall end --call-id <id>
mnemo voicecall status --call-id <id>
mnemo voicecall tail
mnemo voicecall latency                      # summarize turn latency from logs
mnemo 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
mnemo voicecall setup
mnemo 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
mnemo voicecall setup
mnemo 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
mnemo voicecall status --call-id <id>
mnemo voicecall tail
mnemo 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 Mnemo 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
mnemo voicecall setup
mnemo voicecall smoke --to "+15555550123"
```

Then verify the Google Meet transport explicitly:

```bash
mnemo 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 starts the Twilio phone leg through `voicecall.start` with a
pre-connect DTMF sequence. PIN-derived sequences include the Google Meet plugin's
`voiceCall.dtmfDelayMs` as leading Twilio wait digits. The default is 12 seconds
because Meet dial-in prompts can arrive late. Voice Call then redirects back to
realtime handling before the intro greeting is requested.

Use `mnemo 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.
- Google Meet requests intro speech with `voicecall.speak` after the post-DTMF delay.

`mnemo 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.
- `mnemo 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)
