Telnyx Voice Advanced Javascript

team-telnyx/telnyx-voice-advanced-javascript

>- Advanced call control features including DTMF sending, SIPREC recording, noise suppression, client state, and supervisor controls. This skill provides JavaScript SDK examples.

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Install

one command, takes just this skill from the repository

npx skills add https://github.com/team-telnyx/ai --skill telnyx-voice-advanced-javascript

The instruction itself

15 sections, as written by the author

Telnyx Voice Advanced - JavaScript

Installation

npm install telnyx

Setup

import Telnyx from 'telnyx';

const client = new Telnyx({
  apiKey: process.env['TELNYX_API_KEY'], // This is the default and can be omitted
});

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 and retry with exponential backoff
    const retryAfter = err.headers?.['retry-after'] || 1;
    await new Promise(r => setTimeout(r, retryAfter * 1000));
  } 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');
    }
  }
}

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('call_control_id', {
  conversation_id: 'v3:abc123',
  participant: { id: 'v3:abc123def456', role: 'user' },
});

console.log(response.data);

Returns: conversation_id (uuid), result (string)

Update client state

Updates client state

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

const response = await client.calls.actions.updateClientState('call_control_id', {
  client_state: 'aGF2ZSBhIG5pY2UgZGF5ID1d',
});

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('call_control_id', { 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)

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), 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)

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('call_control_id', {
  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:

// 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 |

|-------|-------------|

| 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.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. |