telnyx-voice-streaming-ruby

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

# Telnyx Voice Streaming - Ruby

## Installation

```bash
gem install telnyx
```

## Setup

```ruby
require "telnyx"

client = Telnyx::Client.new(
  api_key: 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:

```ruby
begin
  result = client.messages.send_(to: "+13125550001", from: "+13125550002", text: "Hello")
rescue Telnyx::Errors::APIConnectionError
  puts "Network error — check connectivity and retry"
rescue Telnyx::Errors::RateLimitError
  # 429: rate limited — wait and retry with exponential backoff
  sleep(1) # Check Retry-After header for actual delay
rescue Telnyx::Errors::APIStatusError => e
  puts "API error #{e.status}: #{e.message}"
  if e.status == 422
    puts "Validation error — check required fields and formats"
  end
end
```

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).

## Forking start

Call forking allows you to stream the media from a call to a specific target in realtime. This stream can be used to enable realtime audio analysis to support a 
variety of use cases, including fraud detection, or the creation of AI-generated audio responses. Requests must specify either the `target` attribute or the `rx` and `tx` attributes.

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

Optional: `client_state` (string), `command_id` (string), `rx` (string), `stream_type` (enum: decrypted), `tx` (string)

```ruby
response = client.calls.actions.start_forking("v3:550e8400-e29b-41d4-a716-446655440000_gRU1OGRkYQ")

puts(response)
```

Returns: `result` (string)

## Forking stop

Stop forking a call. **Expected Webhooks:**

- `call.fork.stopped`

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

Optional: `client_state` (string), `command_id` (string), `stream_type` (enum: raw, decrypted)

```ruby
response = client.calls.actions.stop_forking("v3:550e8400-e29b-41d4-a716-446655440000_gRU1OGRkYQ")

puts(response)
```

Returns: `result` (string)

## Streaming start

Start streaming the media from a call to a specific WebSocket address or Dialogflow connection in near-realtime. Audio will be delivered as base64-encoded RTP payload (raw audio), wrapped in JSON payloads. Please find more details about media streaming messages specification under the [link](https://developers.telnyx.com/docs/voice/programmable-voice/media-streaming).

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

Optional: `client_state` (string), `command_id` (string), `custom_parameters` (array[object]), `dialogflow_config` (object), `enable_dialogflow` (boolean), `stream_auth_token` (string), `stream_bidirectional_codec` (enum: PCMU, PCMA, G722, OPUS, AMR-WB, L16), `stream_bidirectional_mode` (enum: mp3, rtp), `stream_bidirectional_sampling_rate` (enum: 8000, 16000, 22050, 24000, 48000), `stream_bidirectional_target_legs` (enum: both, self, opposite), `stream_codec` (enum: PCMU, PCMA, G722, OPUS, AMR-WB, L16, default), `stream_track` (enum: inbound_track, outbound_track, both_tracks), `stream_url` (string)

```ruby
response = client.calls.actions.start_streaming("v3:550e8400-e29b-41d4-a716-446655440000_gRU1OGRkYQ")

puts(response)
```

Returns: `result` (string)

## Streaming stop

Stop streaming a call to a WebSocket. **Expected Webhooks:**

- `streaming.stopped`

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

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

```ruby
response = client.calls.actions.stop_streaming("v3:550e8400-e29b-41d4-a716-446655440000_gRU1OGRkYQ")

puts(response)
```

Returns: `result` (string)

## Transcription start

Start real-time transcription. Transcription will stop on call hang-up, or can be initiated via the Transcription stop command. **Expected Webhooks:**

- `call.transcription`

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

Optional: `client_state` (string), `command_id` (string), `transcription_engine` (enum: Google, Telnyx, Deepgram, Azure, A, B), `transcription_engine_config` (object), `transcription_tracks` (string)

```ruby
response = client.calls.actions.start_transcription("v3:550e8400-e29b-41d4-a716-446655440000_gRU1OGRkYQ")

puts(response)
```

Returns: `result` (string)

## Transcription stop

Stop real-time transcription.

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

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

```ruby
response = client.calls.actions.stop_transcription("v3:550e8400-e29b-41d4-a716-446655440000_gRU1OGRkYQ")

puts(response)
```

Returns: `result` (string)

---

## Webhooks

### Webhook Verification

Telnyx signs webhooks with Ed25519. Each request includes `telnyx-signature-ed25519`
and `telnyx-timestamp` headers. Always verify signatures in production:

```ruby
# In your webhook handler (e.g., Sinatra — use raw body):
post "/webhooks" do
  payload = request.body.read
  headers = {
    "telnyx-signature-ed25519" => request.env["HTTP_TELNYX_SIGNATURE_ED25519"],
    "telnyx-timestamp" => request.env["HTTP_TELNYX_TIMESTAMP"],
  }
  begin
    event = client.webhooks.unwrap(payload, headers)
  rescue => e
    halt 400, "Invalid signature: #{e.message}"
  end
  # Signature valid — event is the parsed webhook payload
  puts "Received event: #{event.data.event_type}"
  status 200
end
```

The following webhook events are sent to your configured webhook URL.
All webhooks include `telnyx-timestamp` and `telnyx-signature-ed25519` headers for Ed25519 signature verification. Use `client.webhooks.unwrap()` to verify.

| Event | Description |
|-------|-------------|
| `callForkStarted` | Call Fork Started |
| `callForkStopped` | Call Fork Stopped |
| `callStreamingFailed` | Call Streaming Failed |
| `callStreamingStarted` | Call Streaming Started |
| `callStreamingStopped` | Call Streaming Stopped |
| `transcription` | Transcription |

### Webhook payload fields

**`callForkStarted`**

| Field | Type | Description |
|-------|------|-------------|
| `data.record_type` | enum: event | Identifies the type of the resource. |
| `data.event_type` | enum: call.fork.started | The type of event being delivered. |
| `data.id` | uuid | Identifies the type of resource. |
| `data.occurred_at` | date-time | ISO 8601 datetime of when the event occurred. |
| `data.payload.connection_id` | string | Call Control App ID (formerly Telnyx connection ID) used in the call. |
| `data.payload.call_control_id` | string | Unique ID for controlling the call. |
| `data.payload.call_leg_id` | string | ID that is unique to the call and can be used to correlate webhook events. |
| `data.payload.call_session_id` | string | ID that is unique to the call session and can be used to correlate webhook events. |
| `data.payload.client_state` | string | State received from a command. |
| `data.payload.stream_type` | enum: decrypted | Type of media streamed. |

**`callForkStopped`**

| Field | Type | Description |
|-------|------|-------------|
| `data.record_type` | enum: event | Identifies the type of the resource. |
| `data.event_type` | enum: call.fork.stopped | The type of event being delivered. |
| `data.id` | uuid | Identifies the type of resource. |
| `data.occurred_at` | date-time | ISO 8601 datetime of when the event occurred. |
| `data.payload.connection_id` | string | Call Control App ID (formerly Telnyx connection ID) used in the call. |
| `data.payload.call_control_id` | string | Unique ID for controlling the call. |
| `data.payload.call_leg_id` | string | ID that is unique to the call and can be used to correlate webhook events. |
| `data.payload.call_session_id` | string | ID that is unique to the call session and can be used to correlate webhook events. |
| `data.payload.client_state` | string | State received from a command. |
| `data.payload.stream_type` | enum: decrypted | Type of media streamed. |

**`callStreamingFailed`**

| Field | Type | Description |
|-------|------|-------------|
| `data.record_type` | enum: event | Identifies the resource. |
| `data.event_type` | enum: streaming.failed | The type of event being delivered. |
| `data.id` | uuid | Identifies the type of resource. |
| `data.occurred_at` | date-time | ISO 8601 datetime of when the event occurred. |
| `data.payload.call_control_id` | string | Call ID used to issue commands via Call Control API. |
| `data.payload.connection_id` | string | Call Control App ID (formerly Telnyx connection ID) used in the call. |
| `data.payload.call_leg_id` | string | ID that is unique to the call and can be used to correlate webhook events. |
| `data.payload.call_session_id` | string | ID that is unique to the call session and can be used to correlate webhook events. |
| `data.payload.client_state` | string | State received from a command. |
| `data.payload.failure_reason` | string | A short description explaning why the media streaming failed. |
| `data.payload.stream_id` | uuid | Identifies the streaming. |
| `data.payload.stream_type` | enum: websocket, dialogflow | The type of stream connection the stream is performing. |

**`callStreamingStarted`**

| Field | Type | Description |
|-------|------|-------------|
| `data.record_type` | enum: event | Identifies the type of the resource. |
| `data.event_type` | enum: streaming.started | The type of event being delivered. |
| `data.id` | uuid | Identifies the type of resource. |
| `data.occurred_at` | date-time | ISO 8601 datetime of when the event occurred. |
| `data.payload.call_control_id` | string | Call ID used to issue commands via Call Control API. |
| `data.payload.connection_id` | string | Call Control App ID (formerly Telnyx connection ID) used in the call. |
| `data.payload.call_leg_id` | string | ID that is unique to the call and can be used to correlate webhook events. |
| `data.payload.call_session_id` | string | ID that is unique to the call session and can be used to correlate webhook events. |
| `data.payload.client_state` | string | State received from a command. |
| `data.payload.stream_url` | string | Destination WebSocket address where the stream is going to be delivered. |

**`callStreamingStopped`**

| Field | Type | Description |
|-------|------|-------------|
| `data.record_type` | enum: event | Identifies the type of the resource. |
| `data.event_type` | enum: streaming.stopped | The type of event being delivered. |
| `data.id` | uuid | Identifies the type of resource. |
| `data.occurred_at` | date-time | ISO 8601 datetime of when the event occurred. |
| `data.payload.call_control_id` | string | Call ID used to issue commands via Call Control API. |
| `data.payload.connection_id` | string | Call Control App ID (formerly Telnyx connection ID) used in the call. |
| `data.payload.call_leg_id` | string | ID that is unique to the call and can be used to correlate webhook events. |
| `data.payload.call_session_id` | string | ID that is unique to the call session and can be used to correlate webhook events. |
| `data.payload.client_state` | string | State received from a command. |
| `data.payload.stream_url` | string | Destination WebSocket address where the stream is going to be delivered. |

**`transcription`**

| Field | Type | Description |
|-------|------|-------------|
| `data.record_type` | enum: event | Identifies the type of the resource. |
| `data.event_type` | enum: call.transcription | The type of event being delivered. |
| `data.id` | uuid | Identifies the type of resource. |
| `data.occurred_at` | date-time | ISO 8601 datetime of when the event occurred. |
| `data.payload.call_control_id` | string | Unique identifier and token for controlling the call. |
| `data.payload.call_leg_id` | string | ID that is unique to the call and can be used to correlate webhook events. |
| `data.payload.call_session_id` | string | ID that is unique to the call session and can be used to correlate webhook events. |
| `data.payload.client_state` | string | Use this field to add state to every subsequent webhook. |
| `data.payload.connection_id` | string | Call Control App ID (formerly Telnyx connection ID) used in the call. |