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:

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).

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 = client.calls.actions.join_ai_assistant(
  "call_control_id",
  conversation_id: "v3:abc123",
  participant: {id: "v3:abc123def456", role: :user}
)

puts(response)

Returns: conversation_id (uuid), result (string)

Update client state

Updates client state

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

response = client.calls.actions.update_client_state("call_control_id", client_state: "aGF2ZSBhIG5pY2UgZGF5ID1d")

puts(response)

Returns: result (string)

Send DTMF

Sends DTMF tones from this leg. DTMF tones will be heard by the other end of the call. Expected Webhooks:

There are no webhooks associated with this command.

POST /calls/{call_control_id}/actions/send_dtmf — Required: digits

Optional: client_state (string), command_id (string), duration_millis (int32)

response = client.calls.actions.send_dtmf("call_control_id", digits: "1www2WABCDw9")

puts(response)

Returns: result (string)

SIPREC start

Start siprec session to configured in SIPREC connector SRS.

Expected Webhooks:

siprec.started
siprec.stopped
siprec.failed

POST /calls/{call_control_id}/actions/siprec_start

Optional: client_state (string), connector_name (string), include_metadata_custom_headers (boolean), secure (boolean), session_timeout_secs (integer), sip_transport (enum: udp, tcp, tls), siprec_track (enum: inbound_track, outbound_track, both_tracks)

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

puts(response)

Returns: result (string)

SIPREC stop

Stop SIPREC session. Expected Webhooks:

siprec.stopped

POST /calls/{call_control_id}/actions/siprec_stop

Optional: client_state (string), command_id (string)

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

puts(response)

Returns: result (string)

Noise Suppression Start (BETA)

POST /calls/{call_control_id}/actions/suppression_start

Optional: client_state (string), command_id (string), direction (enum: inbound, outbound, both), noise_suppression_engine (enum: Denoiser, DeepFilterNet, Krisp, AiCoustics), noise_suppression_engine_config (object)

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

puts(response)

Returns: result (string)

Noise Suppression Stop (BETA)

POST /calls/{call_control_id}/actions/suppression_stop

Optional: client_state (string), command_id (string)

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

puts(response)

Returns: result (string)

Switch supervisor role

Switch the supervisor role for a bridged call. This allows switching between different supervisor modes during an active call

POST /calls/{call_control_id}/actions/switch_supervisor_role — Required: role

response = client.calls.actions.switch_supervisor_role("call_control_id", role: :barge)

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:

# 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
`callConversationEnded`	Call Conversation Ended
`callConversationInsightsGenerated`	Call Conversation Insights Generated
`callDtmfReceived`	Call Dtmf Received
`callMachineDetectionEnded`	Call Machine Detection Ended
`callMachineGreetingEnded`	Call Machine Greeting Ended
`callMachinePremiumDetectionEnded`	Call Machine Premium Detection Ended
`callMachinePremiumGreetingEnded`	Call Machine Premium Greeting Ended
`callReferCompleted`	Call Refer Completed
`callReferFailed`	Call Refer Failed
`callReferStarted`	Call Refer Started
`callSiprecFailed`	Call Siprec Failed
`callSiprecStarted`	Call Siprec Started
`callSiprecStopped`	Call Siprec Stopped

Webhook payload fields

callConversationEnded

Field	Type	Description
`data.record_type`	enum: event	Identifies the type of the resource.
`data.event_type`	enum: call.conversation.ended	The type of event being delivered.
`data.id`	uuid	Unique identifier for the event.
`data.occurred_at`	date-time	ISO 8601 datetime of when the event occurred.
`data.created_at`	date-time	Timestamp when the event was created in the system.
`data.payload.assistant_id`	string	Unique identifier of the assistant involved in the call.
`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 leg.
`data.payload.call_session_id`	string	ID that is unique to the call session (group of related call legs).
`data.payload.client_state`	string	Base64-encoded state received from a command.
`data.payload.calling_party_type`	enum: pstn, sip	The type of calling party connection.
`data.payload.conversation_id`	string	ID unique to the conversation or insight group generated for the call.
`data.payload.duration_sec`	integer	Duration of the conversation in seconds.
`data.payload.from`	string	The caller's number or identifier.
`data.payload.to`	string	The callee's number or SIP address.
`data.payload.llm_model`	string	The large language model used during the conversation.
`data.payload.stt_model`	string	The speech-to-text model used in the conversation.
`data.payload.tts_provider`	string	The text-to-speech provider used in the call.
`data.payload.tts_model_id`	string	The model ID used for text-to-speech synthesis.
`data.payload.tts_voice_id`	string	Voice ID used for TTS.

callConversationInsightsGenerated

Field	Type	Description
`data.record_type`	enum: event	Identifies the type of the resource.
`data.event_type`	enum: call.conversation_insights.generated	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.calling_party_type`	enum: pstn, sip	The type of calling party connection.
`data.payload.insight_group_id`	string	ID that is unique to the insight group being generated for the call.
`data.payload.results`	array[object]	Array of insight results being generated for the call.

callDtmfReceived

Field	Type	Description
`data.record_type`	enum: event	Identifies the type of the resource.
`data.event_type`	enum: call.dtmf.received	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	Identifies the type of resource.
`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.from`	string	Number or SIP URI placing the call.
`data.payload.to`	string	Destination number or SIP URI of the call.
`data.payload.digit`	string	The received DTMF digit or symbol.

callMachineDetectionEnded

Field	Type	Description
`data.record_type`	enum: event	Identifies the type of the resource.
`data.event_type`	enum: call.machine.detection.ended	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.from`	string	Number or SIP URI placing the call.
`data.payload.to`	string	Destination number or SIP URI of the call.
`data.payload.result`	enum: human, machine, not_sure	Answering machine detection result.

callMachineGreetingEnded

Field	Type	Description
`data.record_type`	enum: event	Identifies the type of the resource.
`data.event_type`	enum: call.machine.greeting.ended	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.from`	string	Number or SIP URI placing the call.
`data.payload.to`	string	Destination number or SIP URI of the call.
`data.payload.result`	enum: beep_detected, ended, not_sure	Answering machine greeting ended result.

callMachinePremiumDetectionEnded

Field	Type	Description
`data.record_type`	enum: event	Identifies the type of the resource.
`data.event_type`	enum: call.machine.premium.detection.ended	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.from`	string	Number or SIP URI placing the call.
`data.payload.to`	string	Destination number or SIP URI of the call.
`data.payload.result`	enum: human_residence, human_business, machine, silence, fax_detected, not_sure	Premium Answering Machine Detection result.

callMachinePremiumGreetingEnded

Field	Type	Description
`data.record_type`	enum: event	Identifies the type of the resource.
`data.event_type`	enum: call.machine.premium.greeting.ended	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.from`	string	Number or SIP URI placing the call.
`data.payload.to`	string	Destination number or SIP URI of the call.
`data.payload.result`	enum: beep_detected, no_beep_detected	Premium Answering Machine Greeting Ended result.

callReferCompleted

Field	Type	Description
`data.record_type`	enum: event	Identifies the type of the resource.
`data.event_type`	enum: call.refer.completed	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 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.connection_id`	string	Call Control App ID (formerly Telnyx connection ID) used in the call.
`data.payload.client_state`	string	State received from a command.
`data.payload.from`	string	Number or SIP URI placing the call.
`data.payload.sip_notify_response`	integer	SIP NOTIFY event status for tracking the REFER attempt.
`data.payload.to`	string	Destination number or SIP URI of the call.

callReferFailed

Field	Type	Description
`data.record_type`	enum: event	Identifies the type of the resource.
`data.event_type`	enum: call.refer.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	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.connection_id`	string	Call Control App ID (formerly Telnyx connection ID) used in the call.
`data.payload.client_state`	string	State received from a command.
`data.payload.from`	string	Number or SIP URI placing the call.
`data.payload.sip_notify_response`	integer	SIP NOTIFY event status for tracking the REFER attempt.
`data.payload.to`	string	Destination number or SIP URI of the call.

callReferStarted

Field	Type	Description
`data.record_type`	enum: event	Identifies the type of the resource.
`data.event_type`	enum: call.refer.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	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.connection_id`	string	Call Control App ID (formerly Telnyx connection ID) used in the call.
`data.payload.client_state`	string	State received from a command.
`data.payload.from`	string	Number or SIP URI placing the call.
`data.payload.sip_notify_response`	integer	SIP NOTIFY event status for tracking the REFER attempt.
`data.payload.to`	string	Destination number or SIP URI of the call.

callSiprecFailed

Field	Type	Description
`data.record_type`	enum: event	Identifies the resource.
`data.event_type`	enum: siprec.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_cause`	string	Q850 reason why siprec session failed.

callSiprecStarted

Field	Type	Description
`data.record_type`	enum: event	Identifies the type of the resource.
`data.event_type`	enum: siprec.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.

callSiprecStopped

Field	Type	Description
`data.record_type`	enum: event	Identifies the type of the resource.
`data.event_type`	enum: siprec.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.hangup_cause`	string	Q850 reason why the SIPREC session was stopped.

telnyx-voice-advanced-ruby

Telnyx Voice Advanced - Ruby

Installation

Setup