Telnyx Sip - Go

Installation

go get github.com/team-telnyx/telnyx-go

Setup

import (
  "context"
  "fmt"
  "os"

  "github.com/team-telnyx/telnyx-go"
  "github.com/team-telnyx/telnyx-go/option"
)

client := telnyx.NewClient(
  option.WithAPIKey(os.Getenv("TELNYX_API_KEY")),
)

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:

import "errors"

result, err := client.Messages.Send(ctx, params)
if err != nil {
  var apiErr *telnyx.Error
  if errors.As(err, &apiErr) {
    switch apiErr.StatusCode {
    case 422:
      fmt.Println("Validation error — check required fields and formats")
    case 429:
      // Rate limited — wait and retry with exponential backoff
      fmt.Println("Rate limited, retrying...")
    default:
      fmt.Printf("API error %d: %s\n", apiErr.StatusCode, apiErr.Error())
    }
  } else {
    fmt.Println("Network error — check connectivity and retry")
  }
}

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: Use ListAutoPaging() for automatic iteration: iter := client.Resource.ListAutoPaging(ctx, params); for iter.Next() { item := iter.Current() }.

List all Access IP Ranges

GET /access_ip_ranges

	page, err := client.AccessIPRanges.List(context.TODO(), telnyx.AccessIPRangeListParams{})
	if err != nil {
		panic(err.Error())
	}
	fmt.Printf("%+v\n", page)

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

POST /access_ip_ranges — Required: cidr_block

Optional: description (string)

	accessIPRange, err := client.AccessIPRanges.New(context.TODO(), telnyx.AccessIPRangeNewParams{
		CidrBlock: "cidr_block",
	})
	if err != nil {
		panic(err.Error())
	}
	fmt.Printf("%+v\n", 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 /access_ip_ranges/{access_ip_range_id}

	accessIPRange, err := client.AccessIPRanges.Delete(context.TODO(), "access_ip_range_id")
	if err != nil {
		panic(err.Error())
	}
	fmt.Printf("%+v\n", 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

	page, err := client.Connections.List(context.TODO(), telnyx.ConnectionListParams{})
	if err != nil {
		panic(err.Error())
	}
	fmt.Printf("%+v\n", page)

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)

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}

	connection, err := client.Connections.Get(context.TODO(), "id")
	if err != nil {
		panic(err.Error())
	}
	fmt.Printf("%+v\n", 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

	page, err := client.CredentialConnections.List(context.TODO(), telnyx.CredentialConnectionListParams{})
	if err != nil {
		panic(err.Error())
	}
	fmt.Printf("%+v\n", page)

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), call_cost_in_webhooks (boolean), connection_name (string), 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 credential connection.

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), 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)

	credentialConnection, err := client.CredentialConnections.New(context.TODO(), telnyx.CredentialConnectionNewParams{
		ConnectionName: "my name",
		Password:       "my123secure456password789",
		UserName:       "myusername123",
	})
	if err != nil {
		panic(err.Error())
	}
	fmt.Printf("%+v\n", 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), call_cost_in_webhooks (boolean), connection_name (string), 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}

	credentialConnection, err := client.CredentialConnections.Get(context.TODO(), "id")
	if err != nil {
		panic(err.Error())
	}
	fmt.Printf("%+v\n", 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), call_cost_in_webhooks (boolean), connection_name (string), 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), call_cost_in_webhooks (boolean), connection_name (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), 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)

	credentialConnection, err := client.CredentialConnections.Update(
		context.TODO(),
		"id",
		telnyx.CredentialConnectionUpdateParams{},
	)
	if err != nil {
		panic(err.Error())
	}
	fmt.Printf("%+v\n", 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), call_cost_in_webhooks (boolean), connection_name (string), 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}

	credentialConnection, err := client.CredentialConnections.Delete(context.TODO(), "id")
	if err != nil {
		panic(err.Error())
	}
	fmt.Printf("%+v\n", 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), call_cost_in_webhooks (boolean), connection_name (string), 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

Checks the registration_status for a credential connection, (registration_status) as well as the timestamp for the last SIP registration event (registration_status_updated_at)

POST /credential_connections/{id}/actions/check_registration_status

	response, err := client.CredentialConnections.Actions.CheckRegistrationStatus(context.TODO(), "id")
	if err != nil {
		panic(err.Error())
	}
	fmt.Printf("%+v\n", response.Data)

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

List FQDN connections

Returns a list of your FQDN connections.

GET /fqdn_connections

	page, err := client.FqdnConnections.List(context.TODO(), telnyx.FqdnConnectionListParams{})
	if err != nil {
		panic(err.Error())
	}
	fmt.Printf("%+v\n", page)

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), call_cost_enabled (boolean), call_cost_in_webhooks (boolean), connection_name (string), 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 FQDN connection.

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), 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)

	fqdnConnection, err := client.FqdnConnections.New(context.TODO(), telnyx.FqdnConnectionNewParams{
		ConnectionName: "string",
	})
	if err != nil {
		panic(err.Error())
	}
	fmt.Printf("%+v\n", fqdnConnection.Data)

Retrieve an FQDN connection

Retrieves the details of an existing FQDN connection.

GET /fqdn_connections/{id}

	fqdnConnection, err := client.FqdnConnections.Get(context.TODO(), "1293384261075731499")
	if err != nil {
		panic(err.Error())
	}
	fmt.Printf("%+v\n", 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), call_cost_in_webhooks (boolean), connection_name (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), 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)

	fqdnConnection, err := client.FqdnConnections.Update(
		context.TODO(),
		"1293384261075731499",
		telnyx.FqdnConnectionUpdateParams{},
	)
	if err != nil {
		panic(err.Error())
	}
	fmt.Printf("%+v\n", fqdnConnection.Data)

Delete an FQDN connection

Deletes an FQDN connection.

DELETE /fqdn_connections/{id}

	fqdnConnection, err := client.FqdnConnections.Delete(context.TODO(), "1293384261075731499")
	if err != nil {
		panic(err.Error())
	}
	fmt.Printf("%+v\n", fqdnConnection.Data)