Telnyx Texml - 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).

Important Notes

Pagination: List methods return an auto-paginating iterator. Use for await (const item of result) { ... } to iterate through all pages automatically.

Fetch multiple call resources

Returns multiple call resources for an account. This endpoint is eventually consistent.

GET /texml/Accounts/{account_sid}/Calls

const response = await client.texml.accounts.calls.retrieveCalls('account_sid');

console.log(response.calls);

Returns: calls (array[object]), end (integer), first_page_uri (string), next_page_uri (string), page (integer), page_size (integer), start (integer), uri (string)

Initiate an outbound call

Initiate an outbound TeXML call. Telnyx will request TeXML from the XML Request URL configured for the connection in the Mission Control Portal.

POST /texml/Accounts/{account_sid}/Calls — Required: To, From, ApplicationSid

Optional: AsyncAmd (boolean), AsyncAmdStatusCallback (string), AsyncAmdStatusCallbackMethod (enum: GET, POST), CallerId (string), CancelPlaybackOnDetectMessageEnd (boolean), CancelPlaybackOnMachineDetection (boolean), CustomHeaders (array[object]), DetectionMode (enum: Premium, Regular), FallbackUrl (string), MachineDetection (enum: Enable, Disable, DetectMessageEnd), MachineDetectionSilenceTimeout (integer), MachineDetectionSpeechEndThreshold (integer), MachineDetectionSpeechThreshold (integer), MachineDetectionTimeout (integer), PreferredCodecs (string), Record (boolean), RecordingChannels (enum: mono, dual), RecordingStatusCallback (string), RecordingStatusCallbackEvent (string), RecordingStatusCallbackMethod (enum: GET, POST), RecordingTimeout (integer), RecordingTrack (enum: inbound, outbound, both), SendRecordingUrl (boolean), SipAuthPassword (string), SipAuthUsername (string), SipRegion (enum: US, Europe, Canada, Australia, Middle East), StatusCallback (string), StatusCallbackEvent (enum: initiated, ringing, answered, completed), StatusCallbackMethod (enum: GET, POST), SuperviseCallSid (string), SupervisingRole (enum: barge, whisper, monitor), Texml (string), TimeLimit (integer), Timeout (integer), Trim (enum: trim-silence, do-not-trim), Url (string), UrlMethod (enum: GET, POST)

const response = await client.texml.accounts.calls.calls('account_sid', {
  ApplicationSid: 'example-app-sid',
  From: '+13120001234',
  To: '+13121230000',
});

console.log(response.from);

Returns: from (string), status (string), to (string)

Fetch a call

Returns an individual call identified by its CallSid. This endpoint is eventually consistent.

GET /texml/Accounts/{account_sid}/Calls/{call_sid}

const call = await client.texml.accounts.calls.retrieve('call_sid', { account_sid: 'account_sid' });

console.log(call.account_sid);

Returns: account_sid (string), answered_by (enum: human, machine, not_sure), caller_name (string), date_created (string), date_updated (string), direction (enum: inbound, outbound), duration (string), end_time (string), from (string), from_formatted (string), price (string), price_unit (string), sid (string), start_time (string), status (enum: ringing, in-progress, canceled, completed, failed, busy, no-answer), to (string), to_formatted (string), uri (string)

Update call

Update TeXML call. Please note that the keys present in the payload MUST BE formatted in CamelCase as specified in the example.

POST /texml/Accounts/{account_sid}/Calls/{call_sid}

const call = await client.texml.accounts.calls.update('call_sid', { account_sid: 'account_sid' });

console.log(call.account_sid);

Fetch recordings for a call

Returns recordings for a call identified by call_sid.

GET /texml/Accounts/{account_sid}/Calls/{call_sid}/Recordings.json

const response = await client.texml.accounts.calls.recordingsJson.retrieveRecordingsJson(
  'call_sid',
  { account_sid: 'account_sid' },
);

console.log(response.end);

Returns: end (integer), first_page_uri (uri), next_page_uri (string), page (integer), page_size (integer), previous_page_uri (uri), recordings (array[object]), start (integer), uri (string)

Request recording for a call

Starts recording with specified parameters for call identified by call_sid.

POST /texml/Accounts/{account_sid}/Calls/{call_sid}/Recordings.json

const response = await client.texml.accounts.calls.recordingsJson.recordingsJson('call_sid', {
  account_sid: 'account_sid',
});

console.log(response.account_sid);

Returns: account_sid (string), call_sid (string), channels (enum: 1, 2), conference_sid (uuid), date_created (date-time), date_updated (date-time), duration (string | null), error_code (string | null), price (string | null), price_unit (string | null), sid (string), source (enum: StartCallRecordingAPI, StartConferenceRecordingAPI, OutboundAPI, DialVerb, Conference, RecordVerb, Trunking), start_time (date-time), track (enum: inbound, outbound, both), uri (string)

Update recording on a call

Updates recording resource for particular call.

POST /texml/Accounts/{account_sid}/Calls/{call_sid}/Recordings/{recording_sid}.json

const response = await client.texml.accounts.calls.recordings.recordingSidJson(
  '6a09cdc3-8948-47f0-aa62-74ac943d6c58',
  { account_sid: 'account_sid', call_sid: 'call_sid' },
);

console.log(response.account_sid);

Request siprec session for a call

Starts siprec session with specified parameters for call identified by call_sid.

POST /texml/Accounts/{account_sid}/Calls/{call_sid}/Siprec.json

const response = await client.texml.accounts.calls.siprecJson('call_sid', {
  account_sid: 'account_sid',
});

console.log(response.account_sid);

Returns: account_sid (string), call_sid (string), date_created (string), date_updated (string), error_code (string), sid (string), start_time (string), status (enum: in-progress, stopped), track (enum: both_tracks, inbound_track, outbound_track), uri (string)

Updates siprec session for a call

Updates siprec session identified by siprec_sid.

POST /texml/Accounts/{account_sid}/Calls/{call_sid}/Siprec/{siprec_sid}.json

const response = await client.texml.accounts.calls.siprec.siprecSidJson('siprec_sid', {
  account_sid: 'account_sid',
  call_sid: 'call_sid',
});

console.log(response.account_sid);

Returns: account_sid (string), call_sid (string), date_updated (string), error_code (string), sid (string), status (enum: in-progress, stopped), uri (string)

Start streaming media from a call.

Starts streaming media from a call to a specific WebSocket address.

POST /texml/Accounts/{account_sid}/Calls/{call_sid}/Streams.json

const response = await client.texml.accounts.calls.streamsJson('call_sid', {
  account_sid: 'account_sid',
});

console.log(response.account_sid);

Returns: account_sid (string), call_sid (string), date_updated (date-time), name (string), sid (string), status (enum: in-progress), uri (string)

Update streaming on a call

Updates streaming resource for particular call.

POST /texml/Accounts/{account_sid}/Calls/{call_sid}/Streams/{streaming_sid}.json

const response = await client.texml.accounts.calls.streams.streamingSidJson(
  '6a09cdc3-8948-47f0-aa62-74ac943d6c58',
  { account_sid: 'account_sid', call_sid: 'call_sid' },
);

console.log(response.account_sid);

Returns: account_sid (string), call_sid (string), date_updated (date-time), sid (string), status (enum: stopped), uri (string)

List conference resources

Lists conference resources.

GET /texml/Accounts/{account_sid}/Conferences

const response = await client.texml.accounts.conferences.retrieveConferences('account_sid');

console.log(response.conferences);

Returns: conferences (array[object]), end (integer), first_page_uri (string), next_page_uri (string), page (integer), page_size (integer), start (integer), uri (string)

Fetch a conference resource

Returns a conference resource.

GET /texml/Accounts/{account_sid}/Conferences/{conference_sid}

const conference = await client.texml.accounts.conferences.retrieve('conference_sid', {
  account_sid: 'account_sid',
});

console.log(conference.account_sid);

Returns: account_sid (string), api_version (string), call_sid_ending_conference (string), date_created (string), date_updated (string), friendly_name (string), reason_conference_ended (enum: participant-with-end-conference-on-exit-left, last-participant-left, conference-ended-via-api, time-exceeded), region (string), sid (string), status (enum: init, in-progress, completed), subresource_uris (object), uri (string)

Update a conference resource

Updates a conference resource.

POST /texml/Accounts/{account_sid}/Conferences/{conference_sid}

const conference = await client.texml.accounts.conferences.update('conference_sid', {
  account_sid: 'account_sid',
});

console.log(conference.account_sid);

List conference participants

Lists conference participants

GET /texml/Accounts/{account_sid}/Conferences/{conference_sid}/Participants

const response = await client.texml.accounts.conferences.participants.retrieveParticipants(
  'conference_sid',
  { account_sid: 'account_sid' },
);

console.log(response.end);

Returns: end (integer), first_page_uri (string), next_page_uri (string), page (integer), page_size (integer), participants (array[object]), start (integer), uri (string)

Dial a new conference participant

Dials a new conference participant

POST /texml/Accounts/{account_sid}/Conferences/{conference_sid}/Participants

const response = await client.texml.accounts.conferences.participants.participants(
  'conference_sid',
  { account_sid: 'account_sid' },
);

console.log(response.account_sid);

Returns: account_sid (string), call_sid (string), coaching (boolean), coaching_call_sid (string), conference_sid (uuid), end_conference_on_exit (boolean), hold (boolean), muted (boolean), status (enum: connecting, connected, completed), uri (string)

Get conference participant resource

Gets conference participant resource

GET /texml/Accounts/{account_sid}/Conferences/{conference_sid}/Participants/{call_sid_or_participant_label}

const participant = await client.texml.accounts.conferences.participants.retrieve(
  'call_sid_or_participant_label',
  { account_sid: 'account_sid', conference_sid: 'conference_sid' },
);

console.log(participant.account_sid);

Returns: account_sid (string), api_version (string), call_sid (string), call_sid_legacy (string), coaching (boolean), coaching_call_sid (string), coaching_call_sid_legacy (string), conference_sid (uuid), date_created (string), date_updated (string), end_conference_on_exit (boolean), hold (boolean), muted (boolean), status (enum: connecting, connected, completed), uri (string)

Update a conference participant

Updates a conference participant

POST /texml/Accounts/{account_sid}/Conferences/{conference_sid}/Participants/{call_sid_or_participant_label}

const participant = await client.texml.accounts.conferences.participants.update(
  'call_sid_or_participant_label',
  { account_sid: 'account_sid', conference_sid: 'conference_sid' },
);

console.log(participant.account_sid);

Delete a conference participant

Deletes a conference participant

DELETE /texml/Accounts/{account_sid}/Conferences/{conference_sid}/Participants/{call_sid_or_participant_label}

await client.texml.accounts.conferences.participants.delete('call_sid_or_participant_label', {
  account_sid: 'account_sid',
  conference_sid: 'conference_sid',
});

List conference recordings

Lists conference recordings

GET /texml/Accounts/{account_sid}/Conferences/{conference_sid}/Recordings

const response = await client.texml.accounts.conferences.retrieveRecordings('conference_sid', {
  account_sid: 'account_sid',
});

console.log(response.end);

Returns: end (integer), first_page_uri (string), next_page_uri (string), page (integer), page_size (integer), participants (array[object]), recordings (array[object]), start (integer), uri (string)

Fetch recordings for a conference

Returns recordings for a conference identified by conference_sid.

GET /texml/Accounts/{account_sid}/Conferences/{conference_sid}/Recordings.json

const response = await client.texml.accounts.conferences.retrieveRecordingsJson('conference_sid', {
  account_sid: 'account_sid',
});

console.log(response.end);

List queue resources

Lists queue resources.

GET /texml/Accounts/{account_sid}/Queues

// Automatically fetches more pages as needed.
for await (const queueListResponse of client.texml.accounts.queues.list('account_sid')) {
  console.log(queueListResponse.account_sid);
}

Returns: end (integer), first_page_uri (string), next_page_uri (string), page (integer), page_size (integer), queues (array[object]), start (integer), uri (string)

Create a new queue

Creates a new queue resource.

POST /texml/Accounts/{account_sid}/Queues

const queue = await client.texml.accounts.queues.create('account_sid');

console.log(queue.account_sid);

Returns: account_sid (string), average_wait_time (integer), current_size (integer), date_created (string), date_updated (string), max_size (integer), sid (string), subresource_uris (object), uri (string)

Fetch a queue resource

Returns a queue resource.

GET /texml/Accounts/{account_sid}/Queues/{queue_sid}

const queue = await client.texml.accounts.queues.retrieve('queue_sid', {
  account_sid: 'account_sid',
});

console.log(queue.account_sid);

Update a queue resource

Updates a queue resource.

POST /texml/Accounts/{account_sid}/Queues/{queue_sid}

const queue = await client.texml.accounts.queues.update('queue_sid', {
  account_sid: 'account_sid',
});

console.log(queue.account_sid);

Delete a queue resource

Delete a queue resource.

DELETE /texml/Accounts/{account_sid}/Queues/{queue_sid}

await client.texml.accounts.queues.delete('queue_sid', { account_sid: 'account_sid' });

Fetch multiple recording resources

Returns multiple recording resources for an account.

GET /texml/Accounts/{account_sid}/Recordings.json

const response = await client.texml.accounts.retrieveRecordingsJson('account_sid');

console.log(response.end);

Fetch recording resource

Returns recording resource identified by recording id.

GET /texml/Accounts/{account_sid}/Recordings/{recording_sid}.json

const texmlGetCallRecordingResponseBody =
  await client.texml.accounts.recordings.json.retrieveRecordingSidJson(
    '6a09cdc3-8948-47f0-aa62-74ac943d6c58',
    { account_sid: 'account_sid' },
  );

console.log(texmlGetCallRecordingResponseBody.account_sid);

Returns: account_sid (string), call_sid (string), channels (enum: 1, 2), conference_sid (uuid), date_created (date-time), date_updated (date-time), duration (string | null), error_code (string | null), media_url (uri), sid (string), source (enum: StartCallRecordingAPI, StartConferenceRecordingAPI, OutboundAPI, DialVerb, Conference, RecordVerb, Trunking), start_time (date-time), status (enum: in-progress, completed, paused, stopped), subresources_uris (object), uri (string)

Delete recording resource

Deletes recording resource identified by recording id.

DELETE /texml/Accounts/{account_sid}/Recordings/{recording_sid}.json

await client.texml.accounts.recordings.json.deleteRecordingSidJson(
  '6a09cdc3-8948-47f0-aa62-74ac943d6c58',
  { account_sid: 'account_sid' },
);

List recording transcriptions

Returns multiple recording transcription resources for an account.

GET /texml/Accounts/{account_sid}/Transcriptions.json

const response = await client.texml.accounts.retrieveTranscriptionsJson('account_sid');

console.log(response.end);

Returns: end (integer), first_page_uri (uri), next_page_uri (string), page (integer), page_size (integer), previous_page_uri (uri), start (integer), transcriptions (array[object]), uri (string)

Fetch a recording transcription resource

Returns the recording transcription resource identified by its ID.

GET /texml/Accounts/{account_sid}/Transcriptions/{recording_transcription_sid}.json

const response =
  await client.texml.accounts.transcriptions.json.retrieveRecordingTranscriptionSidJson(
    '6a09cdc3-8948-47f0-aa62-74ac943d6c58',
    { account_sid: 'account_sid' },
  );

console.log(response.account_sid);

Returns: account_sid (string), api_version (string), call_sid (string), date_created (date-time), date_updated (date-time), duration (string | null), recording_sid (string), sid (string), status (enum: in-progress, completed), transcription_text (string), uri (string)

Delete a recording transcription

Permanently deletes a recording transcription.

DELETE /texml/Accounts/{account_sid}/Transcriptions/{recording_transcription_sid}.json

await client.texml.accounts.transcriptions.json.deleteRecordingTranscriptionSidJson(
  '6a09cdc3-8948-47f0-aa62-74ac943d6c58',
  { account_sid: 'account_sid' },
);

Create a TeXML secret

Create a TeXML secret which can be later used as a Dynamic Parameter for TeXML when using Mustache Templates in your TeXML. In your TeXML you will be able to use your secret name, and this name will be replaced by the actual secret value when processing the TeXML on Telnyx side. The secrets are not visible in any logs.

POST /texml/secrets — Required: name, value

const response = await client.texml.secrets({ name: 'My Secret Name', value: 'My Secret Value' });

console.log(response.data);

Returns: name (string), value (enum: REDACTED)

List all TeXML Applications

Returns a list of your TeXML Applications.

GET /texml_applications

// Automatically fetches more pages as needed.
for await (const texmlApplication of client.texmlApplications.list()) {
  console.log(texmlApplication.id);
}

Returns: active (boolean), anchorsite_override (enum: Latency, Chicago, IL, Ashburn, VA, San Jose, CA, Sydney, Australia, Amsterdam, Netherlands, London, UK, Toronto, Canada, Vancouver, Canada, Frankfurt, Germany), call_cost_in_webhooks (boolean), created_at (string), dtmf_type (enum: RFC 2833, Inband, SIP INFO), first_command_timeout (boolean), first_command_timeout_secs (integer), friendly_name (string), id (string), inbound (object), outbound (object), record_type (string), status_callback (uri), status_callback_method (enum: get, post), tags (array[string]), updated_at (string), voice_fallback_url (uri), voice_method (enum: get, post), voice_url (uri)

Creates a TeXML Application

Creates a TeXML Application.

POST /texml_applications — Required: friendly_name, voice_url

Optional: active (boolean), anchorsite_override (enum: Latency, Chicago, IL, Ashburn, VA, San Jose, CA, Sydney, Australia, Amsterdam, Netherlands, London, UK, Toronto, Canada, Vancouver, Canada, Frankfurt, Germany), call_cost_in_webhooks (boolean), dtmf_type (enum: RFC 2833, Inband, SIP INFO), first_command_timeout (boolean), first_command_timeout_secs (integer), inbound (object), outbound (object), status_callback (uri), status_callback_method (enum: get, post), tags (array[string]), voice_fallback_url (uri), voice_method (enum: get, post)

const texmlApplication = await client.texmlApplications.create({
  friendly_name: 'call-router',
  voice_url: 'https://example.com',
});

console.log(texmlApplication.data);

Retrieve a TeXML Application

Retrieves the details of an existing TeXML Application.

GET /texml_applications/{id}

const texmlApplication = await client.texmlApplications.retrieve('1293384261075731499');

console.log(texmlApplication.data);

Update a TeXML Application

Updates settings of an existing TeXML Application.

PATCH /texml_applications/{id} — Required: friendly_name, voice_url

const texmlApplication = await client.texmlApplications.update('1293384261075731499', {
  friendly_name: 'call-router',
  voice_url: 'https://example.com',
});

console.log(texmlApplication.data);

Deletes a TeXML Application

Deletes a TeXML Application.

DELETE /texml_applications/{id}

const texmlApplication = await client.texmlApplications.delete('1293384261075731499');

console.log(texmlApplication.data);

telnyx-texml-javascript