/telnyx-voice-advanced-go

name: telnyx-voice-advanced-go
description: >-
  Advanced call control features including DTMF sending, SIPREC recording, noise
  suppression, client state, and supervisor controls. This skill provides Go SDK
  examples.
metadata:
  author: telnyx
  product: voice-advanced
  language: go
  generated_by: telnyx-openapi-pipeline

<!-- Auto-generated from Telnyx OpenAPI specs. Do not edit. -->

Telnyx Voice Advanced - 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")),
  option.WithPublicKey(os.Getenv("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:

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, then retry the request (bounded 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")
  }
  return err // Propagate: 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).

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)

	response, err := client.Calls.Actions.JoinAIAssistant(
		context.Background(),
		"call_control_id",
		telnyx.CallActionJoinAIAssistantParams{
			ConversationID: "v3:abc123",
			Participant: telnyx.CallActionJoinAIAssistantParamsParticipant{
				ID:   "v3:abc123def456",
				Role: "user",
			},
		},
	)
	if err != nil {
		log.Fatal(err)
	}
	fmt.Printf("%+v\n", response.Data)

Returns: `conversation_id` (uuid), `result` (string)

Update client state

Updates the client state associated with the call. Client state is an opaque value echoed back in subsequent webhooks for the call, letting you correlate events with your application's state.

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

	response, err := client.Calls.Actions.UpdateClientState(
		context.Background(),
		"call_control_id",
		telnyx.CallActionUpdateClientStateParams{
			ClientState: "aGF2ZSBhIG5pY2UgZGF5ID1d",
		},
	)
	if err != nil {
		log.Fatal(err)
	}
	fmt.Printf("%+v\n", response.Data)

Returns: `result` (string)

Start Conversation Relay

Start a Conversation Relay session on an active call. Conversation Relay connects the call audio to your WebSocket so your application can exchange realtime messages with the caller while Telnyx handles speech recognition and text-to-speech. Only one AI Assistant or Conversation Relay session can be active on a call at a time.

`POST /calls/{call_control_id}/actions/conversation_relay_start`

Optional: `assistant` (object), `client_state` (string), `command_id` (string), `conversation_relay_dtmf_detection` (boolean), `conversation_relay_settings` (object), `conversation_relay_url` (string), `custom_parameters` (object), `dtmf_detection` (boolean), `greeting` (string), `interruptible` (enum: none, any, speech, dtmf), `interruptible_greeting` (enum: none, any, speech, dtmf), `interruption_settings` (object), `language` (string), `languages` (array[object]), `provider` (string), `structured_provider` (object), `transcription` (object), `transcription_engine` (enum: Google, Telnyx, Deepgram, Azure, xAI, AssemblyAI, Speechmatics, Soniox, A, B), `transcription_engine_config` (object), `tts_provider` (string), `url` (string), `voice` (string), `voice_settings` (object)

	response, err := client.Calls.Actions.StartConversationRelay(
		context.Background(),
		"call_control_id",
		telnyx.CallActionStartConversationRelayParams{},
	)
	if err != nil {
		log.Fatal(err)
	}
	fmt.Printf("%+v\n", response.Data)

Returns: `conversation_relay_id` (string), `result` (string)

Stop Conversation Relay

Stop the active Conversation Relay session on a call.

`POST /calls/{call_control_id}/actions/conversation_relay_stop`

Optional: `client_state` (string), `command_id` (string)

	response, err := client.Calls.Actions.StopConversationRelay(
		context.Background(),
		"call_control_id",
		telnyx.CallActionStopConversationRelayParams{},
	)
	if err != nil {
		log.Fatal(err)
	}
	fmt.Printf("%+v\n", response.Data)

Returns: `result` (string)

Process a payment

Collect payment details from the caller using DTMF and either charge or tokenize the payment method through a configured Pay connector. Pay pauses active call recordings while sensitive payment details are collected. When `payment_token` is supplied, the DTMF collection steps are skipped and the existing token is sent to the connector.

`POST /calls/{call_control_id}/actions/pay`

Optional: `amount` (number), `client_state` (string), `command_id` (string), `connector_name` (string), `currency` (enum: USD, usd), `description` (string), `inter_digit_timeout_millis` (int32), `language` (string), `max_attemp