---
name: telnyx-voice-advanced-java
description: >-
  Advanced call control features including DTMF sending, SIPREC recording, noise
  suppression, client state, and supervisor controls. This skill provides Java
  SDK examples.
metadata:
  author: telnyx
  product: voice-advanced
  language: java
  generated_by: telnyx-openapi-pipeline
---

<!-- Auto-generated from Telnyx OpenAPI specs. Do not edit. -->

# Telnyx Voice Advanced - Java

## Installation

```text
<!-- Maven -->
<dependency>
    <groupId>com.telnyx.sdk</groupId>
    <artifactId>telnyx</artifactId>
    <version>6.84.0</version>
</dependency>

// Gradle
implementation("com.telnyx.sdk:telnyx:6.84.0")
```

## Setup

```java
import com.telnyx.sdk.client.TelnyxClient;
import com.telnyx.sdk.client.okhttp.TelnyxOkHttpClient;

TelnyxClient client = TelnyxOkHttpClient.fromEnv();
```

All examples below assume `client` is already initialized as shown above.

## Error Handling

All API calls can fail with network errors, rate limits (429), validation errors (422),
or authentication errors (401). Always handle errors in production code:

```java
import com.telnyx.sdk.errors.TelnyxServiceException;

try {
    var result = client.messages().send(params);
} catch (TelnyxServiceException e) {
    System.err.println("API error " + e.statusCode() + ": " + e.getMessage());
    if (e.statusCode() == 422) {
        System.err.println("Validation error — check required fields and formats");
    } else if (e.statusCode() == 429) {
        // Rate limited — wait and retry with exponential backoff
        Thread.sleep(1000);
    }
}
```

Common error codes: `401` invalid API key, `403` insufficient permissions,
`404` resource not found, `422` validation error (check field formats),
`429` rate limited (retry with exponential backoff).

## Join AI Assistant Conversation

Add a participant to an existing AI assistant conversation. Use this command to bring an additional call leg into a running AI conversation.

`POST /calls/{call_control_id}/actions/ai_assistant_join` — Required: `conversation_id`, `participant`

Optional: `client_state` (string), `command_id` (string)

```java
import com.telnyx.sdk.models.calls.actions.ActionJoinAiAssistantParams;
import com.telnyx.sdk.models.calls.actions.ActionJoinAiAssistantResponse;

ActionJoinAiAssistantParams params = ActionJoinAiAssistantParams.builder()
    .callControlId("v3:550e8400-e29b-41d4-a716-446655440000_gRU1OGRkYQ")
    .conversationId("v3:abc123")
    .participant(ActionJoinAiAssistantParams.Participant.builder()
        .id("v3:abc123def456")
        .role(ActionJoinAiAssistantParams.Participant.Role.USER)
        .build())
    .build();
ActionJoinAiAssistantResponse response = client.calls().actions().joinAiAssistant(params);
```

Returns: `conversation_id` (uuid), `result` (string)

## Update client state

Updates client state

`PUT /calls/{call_control_id}/actions/client_state_update` — Required: `client_state`

```java
import com.telnyx.sdk.models.calls.actions.ActionUpdateClientStateParams;
import com.telnyx.sdk.models.calls.actions.ActionUpdateClientStateResponse;

ActionUpdateClientStateParams params = ActionUpdateClientStateParams.builder()
    .callControlId("v3:550e8400-e29b-41d4-a716-446655440000_gRU1OGRkYQ")
    .clientState("aGF2ZSBhIG5pY2UgZGF5ID1d")
    .build();
ActionUpdateClientStateResponse response = client.calls().actions().updateClientState(params);
```

Returns: `result` (string)

## Start Conversation Relay

Start a Conversation Relay session on an active call. Conversation Relay connects the call audio to your WebSocket so your application can exchange realtime messages with the caller while Telnyx handles speech recognition and text-to-speech. Only one AI Assistant or Conversation Relay session can be active on a call at a time.

`POST /calls/{call_control_id}/actions/conversation_relay_start`

Optional: `assistant` (object), `client_state` (string), `command_id` (string), `conversation_relay_dtmf_detection` (boolean), `conversation_relay_settings` (object), `conversation_relay_url` (string), `custom_parameters` (object), `dtmf_detection` (boolean), `greeting` (string), `interruptible` (enum: none, any, speech, dtmf), `interruptible_greeting` (enum: none, any, speech, dtmf), `interruption_settings` (object), `language` (string), `languages` (array[object]), `provider` (string), `structured_provider` (object), `transcription` (object), `transcription_engine` (enum: Google, Telnyx, Deepgram, Azure, xAI, AssemblyAI, Speechmatics, Soniox, A, B), `transcription_engine_config` (object), `tts_provider` (string), `url` (string), `voice` (string), `voice_settings` (object)

```java
import com.telnyx.sdk.models.calls.actions.ActionStartConversationRelayParams;
import com.telnyx.sdk.models.calls.actions.ActionStartConversationRelayResponse;

ActionStartConversationRelayResponse response = client.calls().actions().startConversationRelay("v3:550e8400-e29b-41d4-a716-446655440000_gRU1OGRkYQ");
```

Returns: `conversation_relay_id` (string), `result` (string)

## Stop Conversation Relay

Stop the active Conversation Relay session on a call.

`POST /calls/{call_control_id}/actions/conversation_relay_stop`

Optional: `client_state` (string), `command_id` (string)

```java
import com.telnyx.sdk.models.calls.actions.ActionStopConversationRelayParams;
import com.telnyx.sdk.models.calls.actions.ActionStopConversationRelayResponse;

ActionStopConversationRelayResponse response = client.calls().actions().stopConversationRelay("v3:550e8400-e29b-41d4-a716-446655440000_gRU1OGRkYQ");
```

Returns: `result` (string)

## Send DTMF

Sends DTMF tones from this leg. DTMF tones will be heard by the other end of the call. **Expected Webhooks:**

There are no webhooks associated with this command.

`POST /calls/{call_control_id}/actions/send_dtmf` — Required: `digits`

Optional: `client_state` (string), `command_id` (string), `duration_millis` (int32)

```java
import com.telnyx.sdk.models.calls.actions.ActionSendDtmfParams;
import com.telnyx.sdk.models.calls.actions.ActionSendDtmfResponse;

ActionSendDtmfParams params = ActionSendDtmfParams.builder()
    .callControlId("v3:550e8400-e29b-41d4-a716-446655440000_gRU1OGRkYQ")
    .digits("1www2WABCDw9")
    .build();
ActionSendDtmfResponse response = client.calls().actions().sendDtmf(params);
```

Returns: `result` (string)

## SIPREC start

Start siprec session to configured in SIPREC connector SRS. 

**Expected Webhooks:**

- `siprec.started`
- `siprec.stopped`
- `siprec.failed`

`POST /calls/{call_control_id}/actions/siprec_start`

Optional: `client_state` (string), `connector_name` (string), `include_metadata_custom_headers` (boolean), `secure` (boolean), `session_timeout_secs` (integer), `sip_transport` (enum: udp, tcp, tls), `siprec_track` (enum: inbound_track, outbound_track, both_tracks)

```java
import com.telnyx.sdk.models.calls.actions.ActionStartSiprecParams;
import com.telnyx.sdk.models.calls.actions.ActionStartSiprecResponse;

ActionStartSiprecResponse response = client.calls().actions().startSiprec("v3:550e8400-e29b-41d4-a716-446655440000_gRU1OGRkYQ");
```

Returns: `result` (string)

## SIPREC stop

Stop SIPREC session. **Expected Webhooks:**

- `siprec.stopped`

`POST /calls/{call_control_id}/actions/siprec_stop`

Optional: `client_state` (string), `command_id` (string)

```java
import com.telnyx.sdk.models.calls.actions.ActionStopSiprecParams;
import com.telnyx.sdk.models.calls.actions.ActionStopSiprecResponse;

ActionStopSiprecResponse response = client.calls().actions().stopSiprec("v3:550e8400-e29b-41d4-a716-446655440000_gRU1OGRkYQ");
```

Returns: `result` (string)

## Noise Suppression Start (BETA)

`POST /calls/{call_control_id}/actions/suppression_start`

Optional: `client_state` (string), `command_id` (string), `direction` (enum: inbound, outbound, both), `noise_suppression_engine` (enum: Denoiser, DeepFilterNet, Krisp, AiCoustics, aic_l_quail, aic_l_rook, aic_s_quail, aic_s_rook, quail_voice_focus_s, quail_voice_focus_xs), `noise_suppression_engine_config` (object)

```java
import com.telnyx.sdk.models.calls.actions.ActionStartNoiseSuppressionParams;
import com.telnyx.sdk.models.calls.actions.ActionStartNoiseSuppressionResponse;

ActionStartNoiseSuppressionResponse response = client.calls().actions().startNoiseSuppression("v3:550e8400-e29b-41d4-a716-446655440000_gRU1OGRkYQ");
```

Returns: `result` (string)

## Noise Suppression Stop (BETA)

`POST /calls/{call_control_id}/actions/suppression_stop`

Optional: `client_state` (string), `command_id` (string)

```java
import com.telnyx.sdk.models.calls.actions.ActionStopNoiseSuppressionParams;
import com.telnyx.sdk.models.calls.actions.ActionStopNoiseSuppressionResponse;

ActionStopNoiseSuppressionResponse response = client.calls().actions().stopNoiseSuppression("v3:550e8400-e29b-41d4-a716-446655440000_gRU1OGRkYQ");
```

Returns: `result` (string)

## Switch supervisor role

Switch the supervisor role for a bridged call. This allows switching between different supervisor modes during an active call

`POST /calls/{call_control_id}/actions/switch_supervisor_role` — Required: `role`

```java
import com.telnyx.sdk.models.calls.actions.ActionSwitchSupervisorRoleParams;
import com.telnyx.sdk.models.calls.actions.ActionSwitchSupervisorRoleResponse;

ActionSwitchSupervisorRoleParams params = ActionSwitchSupervisorRoleParams.builder()
    .callControlId("v3:550e8400-e29b-41d4-a716-446655440000_gRU1OGRkYQ")
    .role(ActionSwitchSupervisorRoleParams.Role.BARGE)
    .build();
ActionSwitchSupervisorRoleResponse response = client.calls().actions().switchSupervisorRole(params);
```

Returns: `result` (string)

---

## Webhooks

### Webhook Verification

Telnyx signs webhooks with Ed25519. Each request includes `telnyx-signature-ed25519`
and `telnyx-timestamp` headers. Always verify signatures in production:

```java
import com.telnyx.sdk.core.UnwrapWebhookParams;
import com.telnyx.sdk.core.http.Headers;

// In your webhook handler (e.g., Spring — use raw body):
@PostMapping("/webhooks")
public ResponseEntity<String> handleWebhook(
    @RequestBody String payload,
    HttpServletRequest request) {
  try {
    Headers headers = Headers.builder()
        .put("telnyx-signature-ed25519", request.getHeader("telnyx-signature-ed25519"))
        .put("telnyx-timestamp", request.getHeader("telnyx-timestamp"))
        .build();
    var event = client.webhooks().unwrap(
        UnwrapWebhookParams.builder()
            .body(payload)
            .headers(headers)
            .build());
    // Signature valid — process the event
    System.out.println("Received webhook event");
    return ResponseEntity.ok("OK");
  } catch (Exception e) {
    System.err.println("Webhook verification failed: " + e.getMessage());
    return ResponseEntity.badRequest().body("Invalid signature");
  }
}
```

The following webhook events are sent to your configured webhook URL.
All webhooks include `telnyx-timestamp` and `telnyx-signature-ed25519` headers for Ed25519 signature verification. Use `client.webhooks.unwrap()` to verify.

| Event | Description |
|-------|-------------|
| `callConversationEnded` | Call Conversation Ended |
| `callConversationInsightsGenerated` | Call Conversation Insights Generated |
| `callDtmfReceived` | Call Dtmf Received |
| `callMachineDetectionEnded` | Call Machine Detection Ended |
| `callMachineGreetingEnded` | Call Machine Greeting Ended |
| `callMachinePremiumDetectionEnded` | Call Machine Premium Detection Ended |
| `callMachinePremiumGreetingEnded` | Call Machine Premium Greeting Ended |
| `callReferCompleted` | Call Refer Completed |
| `callReferFailed` | Call Refer Failed |
| `callReferStarted` | Call Refer Started |
| `callSiprecFailed` | Call Siprec Failed |
| `callSiprecStarted` | Call Siprec Started |
| `callSiprecStopped` | Call Siprec Stopped |

### Webhook payload fields

**`callConversationEnded`**

| Field | Type | Description |
|-------|------|-------------|
| `data.record_type` | enum: event | Identifies the type of the resource. |
| `data.event_type` | enum: call.conversation.ended | The type of event being delivered. |
| `data.id` | uuid | Unique identifier for the event. |
| `data.occurred_at` | date-time | ISO 8601 datetime of when the event occurred. |
| `data.created_at` | date-time | Timestamp when the event was created in the system. |
| `data.payload.assistant_id` | string | Unique identifier of the assistant involved in the call. |
| `data.payload.call_control_id` | string | Call ID used to issue commands via Call Control API. |
| `data.payload.connection_id` | string | Call Control App ID (formerly Telnyx connection ID) used in the call. |
| `data.payload.call_leg_id` | string | ID that is unique to the call leg. |
| `data.payload.call_session_id` | string | ID that is unique to the call session (group of related call legs). |
| `data.payload.client_state` | string | Base64-encoded state received from a command. |
| `data.payload.calling_party_type` | enum: pstn, sip | The type of calling party connection. |
| `data.payload.conversation_id` | string | ID unique to the conversation or insight group generated for the call. |
| `data.payload.duration_sec` | integer | Duration of the conversation in seconds. |
| `data.payload.reason` | string \| null | Reason the conversation ended. |
| `data.payload.from` | string | The caller's number or identifier. |
| `data.payload.to` | string | The callee's number or SIP address. |
| `data.payload.llm_model` | string | The large language model used during the conversation. |
| `data.payload.stt_model` | string | The speech-to-text model used in the conversation. |
| `data.payload.tts_provider` | string | The text-to-speech provider used in the call. |
| `data.payload.tts_model_id` | string | The model ID used for text-to-speech synthesis. |
| `data.payload.tts_voice_id` | string | Voice ID used for TTS. |

**`callConversationInsightsGenerated`**

| Field | Type | Description |
|-------|------|-------------|
| `data.record_type` | enum: event | Identifies the type of the resource. |
| `data.event_type` | enum: call.conversation_insights.generated | The type of event being delivered. |
| `data.id` | uuid | Identifies the type of resource. |
| `data.occurred_at` | date-time | ISO 8601 datetime of when the event occurred. |
| `data.payload.call_control_id` | string | Call ID used to issue commands via Call Control API. |
| `data.payload.connection_id` | string | Call Control App ID (formerly Telnyx connection ID) used in the call. |
| `data.payload.call_leg_id` | string | ID that is unique to the call and can be used to correlate webhook events. |
| `data.payload.call_session_id` | string | ID that is unique to the call session and can be used to correlate webhook events. |
| `data.payload.client_state` | string | State received from a command. |
| `data.payload.calling_party_type` | enum: pstn, sip | The type of calling party connection. |
| `data.payload.insight_group_id` | string | ID that is unique to the insight group being generated for the call. |
| `data.payload.results` | array[object] | Array of insight results being generated for the call. |

**`callDtmfReceived`**

| Field | Type | Description |
|-------|------|-------------|
| `data.record_type` | enum: event | Identifies the type of the resource. |
| `data.event_type` | enum: call.dtmf.received | The type of event being delivered. |
| `data.id` | uuid | Identifies the type of resource. |
| `data.occurred_at` | date-time | ISO 8601 datetime of when the event occurred. |
| `data.payload.call_control_id` | string | Call ID used to issue commands via Call Control API. |
| `data.payload.connection_id` | string | Identifies the type of resource. |
| `data.payload.call_leg_id` | string | ID that is unique to the call and can be used to correlate webhook events. |
| `data.payload.call_session_id` | string | ID that is unique to the call session and can be used to correlate webhook events. |
| `data.payload.client_state` | string | State received from a command. |
| `data.payload.from` | string | Number or SIP URI placing the call. |
| `data.payload.to` | string | Destination number or SIP URI of the call. |
| `data.payload.digit` | string | The received DTMF digit or symbol. |

**`callMachineDetectionEnded`**

| Field | Type | Description |
|-------|------|-------------|
| `data.record_type` | enum: event | Identifies the type of the resource. |
| `data.event_type` | enum: call.machine.detection.ended | The type of event being delivered. |
| `data.id` | uuid | Identifies the type of resource. |
| `data.occurred_at` | date-time | ISO 8601 datetime of when the event occurred. |
| `data.payload.call_control_id` | string | Call ID used to issue commands via Call Control API. |
| `data.payload.connection_id` | string | Call Control App ID (formerly Telnyx connection ID) used in the call. |
| `data.payload.call_leg_id` | string | ID that is unique to the call and can be used to correlate webhook events. |
| `data.payload.call_session_id` | string | ID that is unique to the call session and can be used to correlate webhook events. |
| `data.payload.client_state` | string | State received from a command. |
| `data.payload.from` | string | Number or SIP URI placing the call. |
| `data.payload.to` | string | Destination number or SIP URI of the call. |
| `data.payload.result` | enum: human, machine, not_sure | Answering machine detection result. |

**`callMachineGreetingEnded`**

| Field | Type | Description |
|-------|------|-------------|
| `data.record_type` | enum: event | Identifies the type of the resource. |
| `data.event_type` | enum: call.machine.greeting.ended | The type of event being delivered. |
| `data.id` | uuid | Identifies the type of resource. |
| `data.occurred_at` | date-time | ISO 8601 datetime of when the event occurred. |
| `data.payload.call_control_id` | string | Call ID used to issue commands via Call Control API. |
| `data.payload.connection_id` | string | Call Control App ID (formerly Telnyx connection ID) used in the call. |
| `data.payload.call_leg_id` | string | ID that is unique to the call and can be used to correlate webhook events. |
| `data.payload.call_session_id` | string | ID that is unique to the call session and can be used to correlate webhook events. |
| `data.payload.client_state` | string | State received from a command. |
| `data.payload.from` | string | Number or SIP URI placing the call. |
| `data.payload.to` | string | Destination number or SIP URI of the call. |
| `data.payload.result` | enum: beep_detected, ended, not_sure | Answering machine greeting ended result. |

**`callMachinePremiumDetectionEnded`**

| Field | Type | Description |
|-------|------|-------------|
| `data.record_type` | enum: event | Identifies the type of the resource. |
| `data.event_type` | enum: call.machine.premium.detection.ended | The type of event being delivered. |
| `data.id` | uuid | Identifies the type of resource. |
| `data.occurred_at` | date-time | ISO 8601 datetime of when the event occurred. |
| `data.payload.call_control_id` | string | Call ID used to issue commands via Call Control API. |
| `data.payload.connection_id` | string | Call Control App ID (formerly Telnyx connection ID) used in the call. |
| `data.payload.call_leg_id` | string | ID that is unique to the call and can be used to correlate webhook events. |
| `data.payload.call_session_id` | string | ID that is unique to the call session and can be used to correlate webhook events. |
| `data.payload.client_state` | string | State received from a command. |
| `data.payload.from` | string | Number or SIP URI placing the call. |
| `data.payload.to` | string | Destination number or SIP URI of the call. |
| `data.payload.result` | enum: human_residence, human_business, machine, silence, fax_detected, not_sure | Premium Answering Machine Detection result. |

**`callMachinePremiumGreetingEnded`**

| Field | Type | Description |
|-------|------|-------------|
| `data.record_type` | enum: event | Identifies the type of the resource. |
| `data.event_type` | enum: call.machine.premium.greeting.ended | The type of event being delivered. |
| `data.id` | uuid | Identifies the type of resource. |
| `data.occurred_at` | date-time | ISO 8601 datetime of when the event occurred. |
| `data.payload.call_control_id` | string | Call ID used to issue commands via Call Control API. |
| `data.payload.connection_id` | string | Call Control App ID (formerly Telnyx connection ID) used in the call. |
| `data.payload.call_leg_id` | string | ID that is unique to the call and can be used to correlate webhook events. |
| `data.payload.call_session_id` | string | ID that is unique to the call session and can be used to correlate webhook events. |
| `data.payload.client_state` | string | State received from a command. |
| `data.payload.from` | string | Number or SIP URI placing the call. |
| `data.payload.to` | string | Destination number or SIP URI of the call. |
| `data.payload.result` | enum: beep_detected, no_beep_detected | Premium Answering Machine Greeting Ended result. |

**`callReferCompleted`**

| Field | Type | Description |
|-------|------|-------------|
| `data.record_type` | enum: event | Identifies the type of the resource. |
| `data.event_type` | enum: call.refer.completed | The type of event being delivered. |
| `data.id` | uuid | Identifies the type of resource. |
| `data.occurred_at` | date-time | ISO 8601 datetime of when the event occurred. |
| `data.payload.call_control_id` | string | Unique ID for controlling the call. |
| `data.payload.call_leg_id` | string | ID that is unique to the call and can be used to correlate webhook events. |
| `data.payload.call_session_id` | string | ID that is unique to the call session and can be used to correlate webhook events. |
| `data.payload.connection_id` | string | Call Control App ID (formerly Telnyx connection ID) used in the call. |
| `data.payload.client_state` | string | State received from a command. |
| `data.payload.from` | string | Number or SIP URI placing the call. |
| `data.payload.sip_notify_response` | integer | SIP NOTIFY event status for tracking the REFER attempt. |
| `data.payload.to` | string | Destination number or SIP URI of the call. |

**`callReferFailed`**

| Field | Type | Description |
|-------|------|-------------|
| `data.record_type` | enum: event | Identifies the type of the resource. |
| `data.event_type` | enum: call.refer.failed | The type of event being delivered. |
| `data.id` | uuid | Identifies the type of resource. |
| `data.occurred_at` | date-time | ISO 8601 datetime of when the event occurred. |
| `data.payload.call_control_id` | string | Unique ID for controlling the call. |
| `data.payload.call_leg_id` | string | ID that is unique to the call and can be used to correlate webhook events. |
| `data.payload.call_session_id` | string | ID that is unique to the call session and can be used to correlate webhook events. |
| `data.payload.connection_id` | string | Call Control App ID (formerly Telnyx connection ID) used in the call. |
| `data.payload.client_state` | string | State received from a command. |
| `data.payload.from` | string | Number or SIP URI placing the call. |
| `data.payload.sip_notify_response` | integer | SIP NOTIFY event status for tracking the REFER attempt. |
| `data.payload.to` | string | Destination number or SIP URI of the call. |

**`callReferStarted`**

| Field | Type | Description |
|-------|------|-------------|
| `data.record_type` | enum: event | Identifies the type of the resource. |
| `data.event_type` | enum: call.refer.started | The type of event being delivered. |
| `data.id` | uuid | Identifies the type of resource. |
| `data.occurred_at` | date-time | ISO 8601 datetime of when the event occurred. |
| `data.payload.call_control_id` | string | Unique ID for controlling the call. |
| `data.payload.call_leg_id` | string | ID that is unique to the call and can be used to correlate webhook events. |
| `data.payload.call_session_id` | string | ID that is unique to the call session and can be used to correlate webhook events. |
| `data.payload.connection_id` | string | Call Control App ID (formerly Telnyx connection ID) used in the call. |
| `data.payload.client_state` | string | State received from a command. |
| `data.payload.from` | string | Number or SIP URI placing the call. |
| `data.payload.sip_notify_response` | integer | SIP NOTIFY event status for tracking the REFER attempt. |
| `data.payload.to` | string | Destination number or SIP URI of the call. |

**`callSiprecFailed`**

| Field | Type | Description |
|-------|------|-------------|
| `data.record_type` | enum: event | Identifies the resource. |
| `data.event_type` | enum: siprec.failed | The type of event being delivered. |
| `data.id` | uuid | Identifies the type of resource. |
| `data.occurred_at` | date-time | ISO 8601 datetime of when the event occurred. |
| `data.payload.call_control_id` | string | Call ID used to issue commands via Call Control API. |
| `data.payload.connection_id` | string | Call Control App ID (formerly Telnyx connection ID) used in the call. |
| `data.payload.call_leg_id` | string | ID that is unique to the call and can be used to correlate webhook events. |
| `data.payload.call_session_id` | string | ID that is unique to the call session and can be used to correlate webhook events. |
| `data.payload.client_state` | string | State received from a command. |
| `data.payload.failure_cause` | string | Q850 reason why siprec session failed. |

**`callSiprecStarted`**

| Field | Type | Description |
|-------|------|-------------|
| `data.record_type` | enum: event | Identifies the type of the resource. |
| `data.event_type` | enum: siprec.started | The type of event being delivered. |
| `data.id` | uuid | Identifies the type of resource. |
| `data.occurred_at` | date-time | ISO 8601 datetime of when the event occurred. |
| `data.payload.call_control_id` | string | Call ID used to issue commands via Call Control API. |
| `data.payload.connection_id` | string | Call Control App ID (formerly Telnyx connection ID) used in the call. |
| `data.payload.call_leg_id` | string | ID that is unique to the call and can be used to correlate webhook events. |
| `data.payload.call_session_id` | string | ID that is unique to the call session and can be used to correlate webhook events. |
| `data.payload.client_state` | string | State received from a command. |

**`callSiprecStopped`**

| Field | Type | Description |
|-------|------|-------------|
| `data.record_type` | enum: event | Identifies the type of the resource. |
| `data.event_type` | enum: siprec.stopped | The type of event being delivered. |
| `data.id` | uuid | Identifies the type of resource. |
| `data.occurred_at` | date-time | ISO 8601 datetime of when the event occurred. |
| `data.payload.call_control_id` | string | Call ID used to issue commands via Call Control API. |
| `data.payload.connection_id` | string | Call Control App ID (formerly Telnyx connection ID) used in the call. |
| `data.payload.call_leg_id` | string | ID that is unique to the call and can be used to correlate webhook events. |
| `data.payload.call_session_id` | string | ID that is unique to the call session and can be used to correlate webhook events. |
| `data.payload.client_state` | string | State received from a command. |
| `data.payload.hangup_cause` | string | Q850 reason why the SIPREC session was stopped. |