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

Telnyx Voice Advanced - JavaScript

Installation

npm install telnyx@6.74.2

Setup

import Telnyx from 'telnyx';

const client = new Telnyx({
  apiKey: process.env['TELNYX_API_KEY'], // This is the default and can be omitted
  publicKey: process.env['TELNYX_PUBLIC_KEY'], // Required for client.webhooks.unwrap() (webhook verification)
});

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:

try {
  const result = await client.messages.send({ to: '+13125550001', from: '+13125550002', text: 'Hello' });
} catch (err) {
  if (err instanceof Telnyx.APIConnectionError) {
    console.error('Network error — check connectivity and retry');
  } else if (err instanceof Telnyx.RateLimitError) {
    // 429: rate limited — wait, then retry the request (bounded exponential backoff)
    const retryAfter = err.headers?.['retry-after'] || 1;
    await new Promise(r => setTimeout(r, retryAfter * 1000));
    // ...retry the call here (give up after a few attempts)
  } else if (err instanceof Telnyx.APIError) {
    console.error(`API error ${err.status}: ${err.message}`);
    if (err.status === 422) {
      console.error('Validation error — check required fields and formats');
    }
  }
  throw err; // Re-throw: a failed request must never look like success to the caller
}

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)

const response = await client.calls.actions.joinAIAssistant('v3:550e8400-e29b-41d4-a716-446655440000_gRU1OGRkYQ', {
  conversation_id: 'v3:abc123',
  participant: { id: 'v3:abc123def456', role: 'user' },
});

console.log(response.data);

Returns: conversation_id (uuid), result (string)

Update client state

Updates the client state associated with the call. Client state is an opaque value echoed back in subsequent webhooks for the call, letting you correlate events with your application's state.

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

const response = await client.calls.actions.updateClientState('v3:550e8400-e29b-41d4-a716-446655440000_gRU1OGRkYQ', {
  client_state: 'aGF2ZSBhIG5pY2UgZGF5ID1d',
});

console.log(response.data);

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)

const response = await client.calls.actions.startConversationRelay('v3:550e8400-e29b-41d4-a716-446655440000_gRU1OGRkYQ');

console.log(response.data);

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)

const response = await client.calls.actions.stopConversationRelay('v3:550e8400-e29b-41d4-a716-446655440000_gRU1OGRkYQ');

console.log(response.data);

Returns: result (string)

Process a payment

Collect payment details from the caller using DTMF and either charge or tokenize the payment method through a configured Pay connector. Pay pauses active call recordings while sensitive payment details are collected. When payment_token is supplied, the DTMF collection steps are skipped and the existing token is sent to the connector.

POST /calls/{call_control_id}/actions/pay

Optional: amount (number), client_state (string), command_id (string), connector_name (string), currency (enum: USD, usd), description (string), inter_digit_timeout_millis (int32), language (string), max_attempts (int32), metadata (object), min_postal_code_length (integer), parameters (object), payment_method (enum: credit-card, ach-debit), payment_token (string), postal_code (object), prompts (object), service_level (string), timeout_millis (int32), transaction_type (enum: charge, tokenize), valid_card_types (array[string]), voice (string)

const response = await client.calls.actions.pay('v3:550e8400-e29b-41d4-a716-446655440000_gRU1OGRkYQ', {
  connector_name: 'Default',
});

console.log(response.data);

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)

const response = await client.calls.actions.sendDtmf('v3:550e8400-e29b-41d4-a716-446655440000_gRU1OGRkYQ', { digits: '1www2WABCDw9' });

console.log(response.data);

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)

const response = await client.calls.actions.startSiprec('v3:550e8400-e29b-41d4-a716-446655440000_gRU1OGRkYQ');

console.log(response.data);

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)

const response = await client.calls.actions.stopSiprec('v3:550e8400-e29b-41d4-a716-446655440000_gRU1OGRkYQ');

console.log(response.data);

Returns: result (string)

Noise Suppression Start (BETA)

Start noise suppression on an active call to reduce background noise. This feature is currently in 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)

const response = await client.calls.actions.startNoiseSuppression('v3:550e8400-e29b-41d4-a716-446655440000_gRU1OGRkYQ');

console.log(response.data);

Returns: result (string)

Noise Suppression Stop (BETA)

Stop noise suppression previously started on an active call. This feature is currently in beta.

POST /calls/{call_control_id}/actions/suppression_stop

Optional: client_state (string), command_id (string)

const response = await client.calls.actions.stopNoiseSuppression('v3:550e8400-e29b-41d4-a716-446655440000_gRU1OGRkYQ');

console.log(response.data);

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

const response = await client.calls.actions.switchSupervisorRole('v3:550e8400-e29b-41d4-a716-446655440000_gRU1OGRkYQ', {
  role: 'barge',
});

console.log(response.data);

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:

Verification needs your account's public key (Mission Control Portal → API Keys → Public Key). The SDK reads it from TELNYX_PUBLIC_KEY (the ## Setup block above passes it explicitly); without it every valid webhook fails verification and the handler below returns 400.

// In your webhook handler (e.g., Express — use raw body, not parsed JSON):
app.post('/webhooks', express.raw({ type: 'application/json' }), async (req, res) => {
  try {
    const event = await client.webhooks.unwrap(req.body.toString(), {
      headers: req.headers,
    });
    // Signature valid — event is the parsed webhook payload
    console.log('Received event:', event.data.event_type);
    res.status(200).send('OK');
  } catch (err) {
    console.error('Webhook verification failed:', err.message);
    res.status(400).send('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
callConversationCreated	Call Conversation Created. Emitted when a conversation is created for a call, including when an AI assistant starts automatically after an answer command with assistant.id or a dial command with assistant.id, or through ai_assistant_start or gather_using_ai. Read data.payload.conversation_id and correlate it with data.payload.call_control_id
callConversationEnded	Call Conversation Ended
callConversationInsightsGenerated	Call Conversation Insights Generated
callConversationStartFailed	Call Conversation Start Failed. Emitted when an AI assistant requested with an answer or dial command (assistant.id) could not be started after the call was answered, for example because the assistant ID does not exist. No conversation is created, so neither call.conversation.created nor call.conversation.ended is sent for this attempt
callDtmfReceived	Call Dtmf Received
callMachineDetectionEnded	Call Machine Detection Ended
callMachineGreetingEnded	Call Machine Greeting Ended
callMachinePremiumCallScreeningDetected	Call Machine Premium Call Screening Detected. This webhook is sent when answering_machine_detection=premium_ios_call_screening_detection detects an Apple Call Screening tone. Premium AMD is then restarted on the screened call; expect another call.machine.premium.detection.ended webhook with the post-screening classification
callMachinePremiumDetectionEnded	Call Machine Premium Detection Ended
callMachinePremiumDetectionStarted	Call Machine Premium Detection Started
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

callConversationCreated

Field	Type	Description
data.record_type	enum: event	Identifies the type of the resource.
data.event_type	enum: call.conversation.created	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.call_control_id	string	Call ID used to issue commands via Call Control API.
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.connection_id	string	Call Control App ID (formerly Telnyx connection ID) used in the call.
data.payload.client_state	string	Base64-encoded state received from a command.
data.payload.conversation_id	uuid	Unique identifier of the conversation created for this call.
data.payload.from	string	The caller's number or identifier.
data.payload.to	string	The callee's number or SIP address.
data.payload.calling_party_type	enum: pstn, sip	The type of calling party connection.

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.messages	array[object]	The conversation transcript, in order.
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.

callConversationStartFailed

Field	Type	Description
data.record_type	enum: event	Identifies the type of the resource.
data.event_type	enum: call.conversation.start_failed	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.call_control_id	string	Call ID used to issue commands via Call Control API.
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.connection_id	string	Call Control App ID (formerly Telnyx connection ID) used in the call.
data.payload.client_state	string	Base64-encoded state received from a command.
data.payload.from	string	The caller's number or identifier.
data.payload.to	string	The callee's number or SIP address.
data.payload.calling_party_type	enum: pstn, sip	The type of calling party connection.
data.payload.assistant_id	string	Identifier of the AI assistant that failed to start.
data.payload.reason	enum: invalid_request, service_error	Why the conversation could not be started.

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.

callMachinePremiumCallScreeningDetected

Field	Type	Description
data.record_type	enum: event	Identifies the type of the resource.
data.event_type	enum: call.machine.premium.call_screening.detected	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: screening	Apple Call Screening detection 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.

callMachinePremiumDetectionStarted

Field	Type	Description
data.record_type	enum: event	Identifies the type of the resource.
data.event_type	enum: call.machine.premium.detection.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.
data.payload.from	string	Number or SIP URI placing the call.
data.payload.to	string	Destination number or SIP URI of the call.

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, prompt_ended	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.