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);
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)
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);
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)
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);
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)
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);
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)
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);
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)
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);
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)
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);
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)
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);
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)
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);
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)
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);
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)
Update a TeXML Application
Updates settings of an existing TeXML Application.
PATCH /texml_applications/{id} — 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.update('1293384261075731499', { friendly_name: 'call-router', voice_url: 'https://example.com', });
console.log(texmlApplication.data);
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)
Deletes a TeXML Application
Deletes a TeXML Application.
DELETE /texml_applications/{id}
const texmlApplication = await client.texmlApplications.delete('1293384261075731499');
console.log(texmlApplication.data);
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)