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telnyx-sip-javascript

Configure SIP trunking connections and outbound voice profiles. Use when connecting PBX systems or managing SIP infrastructure. This skill provides JavaScript SDK examples.

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Telnyx Sip - 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).

Important Notes

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

List all Access IP Ranges

Retrieve a paginated list of access IP ranges configured on your account.

GET /access_ip_ranges

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

Returns: cidr_block (string), created_at (date-time), description (string), id (string), status (enum: pending, added), updated_at (date-time), user_id (string)

Create new Access IP Range

Create a new access IP range on your account.

POST /access_ip_ranges — Required: cidr_block

Optional: description (string)

const accessIPRange = await client.accessIPRanges.create({ cidr_block: '203.0.113.0/24' });

console.log(accessIPRange.id);

Returns: cidr_block (string), created_at (date-time), description (string), id (string), status (enum: pending, added), updated_at (date-time), user_id (string)

Delete access IP ranges

Delete an access IP range from your account.

DELETE /access_ip_ranges/{access_ip_range_id}

const accessIPRange = await client.accessIPRanges.delete('550e8400-e29b-41d4-a716-446655440000');

console.log(accessIPRange.id);

Returns: cidr_block (string), created_at (date-time), description (string), id (string), status (enum: pending, added), updated_at (date-time), user_id (string)

List connections

Returns a list of your connections irrespective of type.

GET /connections

// Automatically fetches more pages as needed.
for await (const connectionListResponse of client.connections.list()) {
  console.log(connectionListResponse.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), connection_name (string), created_at (string), id (string), outbound_voice_profile_id (string), record_type (string), tags (array[string]), updated_at (string), webhook_api_version (enum: 1, 2), webhook_event_failover_url (uri), webhook_event_url (uri)

Count connections

Returns the number of connections associated with the authenticated user, grouped by connection type, together with the connection limits that apply to the user. Forward-only connections are excluded from the counts.

GET /connections/count

const response = await client.connections.retrieveCount();

console.log(response.data);

Returns: counts (object), limits (object), record_type (string)

Retrieve a connection

Retrieves the high-level details of an existing connection. To retrieve specific authentication information, use the endpoint for the specific connection type.

GET /connections/{id}

const connection = await client.connections.retrieve('550e8400-e29b-41d4-a716-446655440000');

console.log(connection.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), connection_name (string), created_at (string), id (string), outbound_voice_profile_id (string), record_type (string), tags (array[string]), updated_at (string), webhook_api_version (enum: 1, 2), webhook_event_failover_url (uri), webhook_event_url (uri)

List credential connections

Returns a list of your credential connections.

GET /credential_connections

// Automatically fetches more pages as needed.
for await (const credentialConnection of client.credentialConnections.list()) {
  console.log(credentialConnection.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), android_push_credential_id (string | null), bridge_generate_comfort_noise_on_cn (boolean), call_cost_in_webhooks (boolean), connection_name (string), conversation_persistence (boolean), created_at (string), default_on_hold_comfort_noise_enabled (boolean), dtmf_type (enum: RFC 2833, Inband, SIP INFO), encode_contact_header_enabled (boolean), encrypted_media (enum: SRTP, None), id (string), inbound (object), ios_push_credential_id (string | null), jitter_buffer (object), noise_suppression (enum: inbound, outbound, both, disabled), noise_suppression_details (object), onnet_t38_passthrough_enabled (boolean), outbound (object), password (string), record_type (string), rtcp_settings (object), sip_uri_calling_preference (enum: disabled, unrestricted, internal), tags (array[string]), updated_at (string), user_name (string), webhook_api_version (enum: 1, 2), webhook_event_failover_url (uri), webhook_event_url (uri), webhook_timeout_secs (integer | null)

Create a credential connection

Creates a new credential-based SIP connection. Credential connections authenticate with a username and password rather than by IP address.

POST /credential_connections — Required: user_name, password, connection_name

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), android_push_credential_id (string | null), bridge_generate_comfort_noise_on_cn (boolean), call_cost_in_webhooks (boolean), default_on_hold_comfort_noise_enabled (boolean), dtmf_type (enum: RFC 2833, Inband, SIP INFO), encode_contact_header_enabled (boolean), encrypted_media (enum: SRTP, None), inbound (object), ios_push_credential_id (string | null), jitter_buffer (object), noise_suppression (enum: inbound, outbound, both, disabled), noise_suppression_details (object), onnet_t38_passthrough_enabled (boolean), outbound (object), rtcp_settings (object), sip_uri_calling_preference (enum: disabled, unrestricted, internal), tags (array[string]), webhook_api_version (enum: 1, 2, texml), webhook_event_failover_url (uri), webhook_event_url (uri), webhook_timeout_secs (integer | null)

const credentialConnection = await client.credentialConnections.create({
  connection_name: 'my name',
  password: 'my123secure456password789',
  user_name: 'myusername123',
});

console.log(credentialConnection.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), android_push_credential_id (string | null), bridge_generate_comfort_noise_on_cn (boolean), call_cost_in_webhooks (boolean), connection_name (string), conversation_persistence (boolean), created_at (string), default_on_hold_comfort_noise_enabled (boolean), dtmf_type (enum: RFC 2833, Inband, SIP INFO), encode_contact_header_enabled (boolean), encrypted_media (enum: SRTP, None), id (string), inbound (object), ios_push_credential_id (string | null), jitter_buffer (object), noise_suppression (enum: inbound, outbound, both, disabled), noise_suppression_details (object), onnet_t38_passthrough_enabled (boolean), outbound (object), password (string), record_type (string), rtcp_settings (object), sip_uri_calling_preference (enum: disabled, unrestricted, internal), tags (array[string]), updated_at (string), user_name (string), webhook_api_version (enum: 1, 2), webhook_event_failover_url (uri), webhook_event_url (uri), webhook_timeout_secs (integer | null)

Retrieve a credential connection

Retrieves the details of an existing credential connection.

GET /credential_connections/{id}

const credentialConnection = await client.credentialConnections.retrieve('550e8400-e29b-41d4-a716-446655440000');

console.log(credentialConnection.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), android_push_credential_id (string | null), bridge_generate_comfort_noise_on_cn (boolean), call_cost_in_webhooks (boolean), connection_name (string), conversation_persistence (boolean), created_at (string), default_on_hold_comfort_noise_enabled (boolean), dtmf_type (enum: RFC 2833, Inband, SIP INFO), encode_contact_header_enabled (boolean), encrypted_media (enum: SRTP, None), id (string), inbound (object), ios_push_credential_id (string | null), jitter_buffer (object), noise_suppression (enum: inbound, outbound, both, disabled), noise_suppression_details (object), onnet_t38_passthrough_enabled (boolean), outbound (object), password (string), record_type (string), rtcp_settings (object), sip_uri_calling_preference (enum: disabled, unrestricted, internal), tags (array[string]), updated_at (string), user_name (string), webhook_api_version (enum: 1, 2), webhook_event_failover_url (uri), webhook_event_url (uri), webhook_timeout_secs (integer | null)

Update a credential connection

Updates settings of an existing credential connection.

PATCH /credential_connections/{id}

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), android_push_credential_id (string | null), bridge_generate_comfort_noise_on_cn (boolean), call_cost_in_webhooks (boolean), connection_name (string), conversation_persistence (boolean), default_on_hold_comfort_noise_enabled (boolean), dtmf_type (enum: RFC 2833, Inband, SIP INFO), encode_contact_header_enabled (boolean), encrypted_media (enum: SRTP, None), inbound (object), ios_push_credential_id (string | null), jitter_buffer (object), noise_suppression (enum: inbound, outbound, both, disabled), noise_suppression_details (object), onnet_t38_passthrough_enabled (boolean), outbound (object), password (string), rtcp_settings (object), sip_uri_calling_preference (enum: disabled, unrestricted, internal), tags (array[string]), user_name (string), webhook_api_version (enum: 1, 2), webhook_event_failover_url (uri), webhook_event_url (uri), webhook_timeout_secs (integer | null)

const credentialConnection = await client.credentialConnections.update('550e8400-e29b-41d4-a716-446655440000');

console.log(credentialConnection.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), android_push_credential_id (string | null), bridge_generate_comfort_noise_on_cn (boolean), call_cost_in_webhooks (boolean), connection_name (string), conversation_persistence (boolean), created_at (string), default_on_hold_comfort_noise_enabled (boolean), dtmf_type (enum: RFC 2833, Inband, SIP INFO), encode_contact_header_enabled (boolean), encrypted_media (enum: SRTP, None), id (string), inbound (object), ios_push_credential_id (string | null), jitter_buffer (object), noise_suppression (enum: inbound, outbound, both, disabled), noise_suppression_details (object), onnet_t38_passthrough_enabled (boolean), outbound (object), password (string), record_type (string), rtcp_settings (object), sip_uri_calling_preference (enum: disabled, unrestricted, internal), tags (array[string]), updated_at (string), user_name (string), webhook_api_version (enum: 1, 2), webhook_event_failover_url (uri), webhook_event_url (uri), webhook_timeout_secs (integer | null)

Delete a credential connection

Deletes an existing credential connection.

DELETE /credential_connections/{id}

const credentialConnection = await client.credentialConnections.delete('550e8400-e29b-41d4-a716-446655440000');

console.log(credentialConnection.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), android_push_credential_id (string | null), bridge_generate_comfort_noise_on_cn (boolean), call_cost_in_webhooks (boolean), connection_name (string), conversation_persistence (boolean), created_at (string), default_on_hold_comfort_noise_enabled (boolean), dtmf_type (enum: RFC 2833, Inband, SIP INFO), encode_contact_header_enabled (boolean), encrypted_media (enum: SRTP, None), id (string), inbound (object), ios_push_credential_id (string | null), jitter_buffer (object), noise_suppression (enum: inbound, outbound, both, disabled), noise_suppression_details (object), onnet_t38_passthrough_enabled (boolean), outbound (object), password (string), record_type (string), rtcp_settings (object), sip_uri_calling_preference (enum: disabled, unrestricted, internal), tags (array[string]), updated_at (string), user_name (string), webhook_api_version (enum: 1, 2), webhook_event_failover_url (uri), webhook_event_url (uri), webhook_timeout_secs (integer | null)

Check a Credential Connection Registration Status

Returns the live SIP registration status for a credential connection. Reports whether the endpoint is currently registered (status) and the timestamp of the last SIP registration event (last_registration).

POST /credential_connections/{id}/actions/check_registration_status

const response = await client.credentialConnections.actions.checkRegistrationStatus('550e8400-e29b-41d4-a716-446655440000');

console.log(response.data);

Returns: ip_address (string | null), last_registration (string | null), port (integer | null), record_type (string), sip_username (string | null), status (enum: Not Applicable, Not Registered, Failed, Expired, Registered, Unregistered), transport (string | null), user_agent (string | null)

List FQDN connections

Returns a list of your FQDN connections.

GET /fqdn_connections

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

Returns: active (boolean), adjust_dtmf_timestamp (boolean), anchorsite_override (enum: Latency, Chicago, IL, Ashburn, VA, San Jose, CA, Sydney, Australia, Amsterdam, Netherlands, London, UK, Toronto, Canada, Vancouver, Canada, Frankfurt, Germany), android_push_credential_id (string | null), bridge_generate_comfort_noise_on_cn (boolean), call_cost_enabled (boolean), call_cost_in_webhooks (boolean), connection_name (string), conversation_persistence (boolean), created_at (string), default_on_hold_comfort_noise_enabled (boolean), dtmf_type (enum: RFC 2833, Inband, SIP INFO), encode_contact_header_enabled (boolean), encrypted_media (enum: SRTP, None), id (string), ignore_dtmf_duration (boolean), ignore_mark_bit (boolean), inbound (object), ios_push_credential_id (string | null), jitter_buffer (object), microsoft_teams_sbc (boolean), noise_suppression (enum: inbound, outbound, both, disabled), noise_suppression_details (object), onnet_t38_passthrough_enabled (boolean), outbound (object), password (string), record_type (string), rtcp_settings (object), rtp_pass_codecs_on_stream_change (boolean), send_normalized_timestamps (boolean), tags (array[string]), third_party_control_enabled (boolean), transport_protocol (enum: UDP, TCP, TLS), txt_name (string), txt_ttl (integer), txt_value (string), updated_at (string), user_name (string), webhook_api_version (enum: 1, 2), webhook_event_failover_url (uri), webhook_event_url (uri), webhook_timeout_secs (integer | null)

Create an FQDN connection

Creates a new FQDN-based SIP connection. FQDN connections authenticate by your registered domain names rather than static IP addresses.

POST /fqdn_connections — Required: connection_name

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), android_push_credential_id (string | null), bridge_generate_comfort_noise_on_cn (boolean), call_cost_in_webhooks (boolean), default_on_hold_comfort_noise_enabled (boolean), dtmf_type (enum: RFC 2833, Inband, SIP INFO), encode_contact_header_enabled (boolean), encrypted_media (enum: SRTP, None), inbound (object), ios_push_credential_id (string | null), jitter_buffer (object), microsoft_teams_sbc (boolean), noise_suppression (enum: inbound, outbound, both, disabled), noise_suppression_details (object), onnet_t38_passthrough_enabled (boolean), outbound (object), rtcp_settings (object), tags (array[string]), transport_protocol (enum: UDP, TCP, TLS), webhook_api_version (enum: 1, 2), webhook_event_failover_url (uri), webhook_event_url (uri), webhook_timeout_secs (integer | null)

const fqdnConnection = await client.fqdnConnections.create({ connection_name: 'my-sip-connection' });

console.log(fqdnConnection.data);

Retrieve an FQDN authentication

Retrieves the details of an existing FQDN authentication strategy for a specific FQDN connection.

GET /fqdn_connections/{fqdn_connection_id}/fqdn_authentication

// Automatically fetches more pages as needed.
for await (const response of client.fqdnConnections.fqdnAuthentication.list()) {
  console.log(response);
}

Returns: connection_id (string), failover_url (uri), fqdn_outbound_authentication (enum: ip-authentication, credential-authentication), id (string), ip_authentication_method (enum: token, p-charge-info), microsoft_teams_sbc (boolean), password (string), record_type (string), txt_name (string), txt_ttl (integer), txt_value (string), user_name (string), webhook_url (uri)

Update an FQDN authentication

Updates the FQDN authentication strategy for a specific FQDN connection.

PATCH /fqdn_connections/{fqdn_connection_id}/fqdn_authentication

Optional: failover_url (uri), fqdn_outbound_authentication (enum: ip-authentication, credential-authentication), ip_authentication_method (enum: token, p-charge-info), password (string), txt_name (string), txt_ttl (integer), txt_value (string), user_name (string), webhook_url (uri)

const response = await client.fqdnConnections.fqdnAuthentication.patchAll('fqdn_connection_id');

console.log(response.data);

Retrieve an FQDN connection

Retrieves the details of an existing FQDN connection.

GET /fqdn_connections/{id}

const fqdnConnection = await client.fqdnConnections.retrieve('1293384261075731499');

console.log(fqdnConnection.data);

Update an FQDN connection

Updates settings of an existing FQDN connection.

PATCH /fqdn_connections/{id}

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), android_push_credential_id (string | null), bridge_generate_comfort_noise_on_cn (boolean), call_cost_in_webhooks (boolean), connection_name (string), conversation_persistence (boolean), default_on_hold_comfort_noise_enabled (boolean), dtmf_type (enum: RFC 2833, Inband, SIP INFO), encode_contact_header_enabled (boolean), encrypted_media (enum: SRTP, None), inbound (object), ios_push_credential_id (string | null), jitter_buffer (object), noise_suppression (enum: inbound, outbound, both, disabled), noise_suppression_details (object), onnet_t38_passthrough_enabled (boolean), outbound (object), rtcp_settings (object), tags (array[string]), transport_protocol (enum: UDP, TCP, TLS), webhook_api_version (enum: 1, 2), webhook_event_failover_url (uri), webhook_event_url (uri), webhook_timeout_secs (integer | null)

const fqdnConnection = await client.fqdnConnections.update('1293384261075731499');

console.log(fqdnConnection.data);

Delete an FQDN connection

Permanently deletes the specified FQDN connection from your account.

DELETE /fqdn_connections/{id}

const fqdnConnection = await client.fqdnConnections.delete('1293384261075731499');

console.log(fqdnConnection.data);