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:

response = client.calls.dial(
  connection_id: "7267xxxxxxxxxxxxxx",
  from: "+18005550101",
  to: "+18005550100"
)
puts(response)

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

Phone numbers must be in E.164 format (e.g., +13125550001). Include the + prefix and country code. No spaces, dashes, or parentheses.
Pagination: Use .auto_paging_each for automatic iteration: page.auto_paging_each { |item| puts item.id }.

Operational Caveats

Call Control is event-driven. After dial() or an inbound webhook, issue follow-up commands from webhook handlers using the call_control_id in the event payload.
Outbound and inbound flows are different: outbound calls start with dial(), while inbound calls must be answered from the incoming webhook before other commands run.
A publicly reachable webhook endpoint is required for real call control. Without it, calls may connect but your application cannot drive the live call state.

Reference Use Rules

Do not invent Telnyx parameters, enums, response fields, or webhook fields.

If the parameter, enum, or response field you need is not shown inline in this skill, read references/api-details.md before writing code.
Before using any operation in ## Additional Operations, read the optional-parameters section and the response-schemas section.
Before reading or matching webhook fields beyond the inline examples, read the webhook payload reference.

Core Tasks

Dial an outbound call

Primary voice entrypoint. Agents need the async call-control identifiers returned here.

client.calls.dial() — POST /calls

Parameter	Type	Required	Description
`to`	string (E.164)	Yes	The DID or SIP URI to dial out to.
`from`	string (E.164)	Yes	The `from` number to be used as the caller id presented to t...
`connection_id`	string (UUID)	Yes	The ID of the Call Control App (formerly ID of the connectio...
`timeout_secs`	integer	No	The number of seconds that Telnyx will wait for the call to ...
`billing_group_id`	string (UUID)	No	Use this field to set the Billing Group ID for the call.
`client_state`	string	No	Use this field to add state to every subsequent webhook.
...			+48 optional params in references/api-details.md

response = client.calls.dial(
  connection_id: "7267xxxxxxxxxxxxxx",
  from: "+18005550101",
  to: "+18005550100"
)

puts(response)

Primary response fields:

response.data.call_control_id
response.data.call_leg_id
response.data.call_session_id
response.data.is_alive
response.data.recording_id
response.data.call_duration

Answer an inbound call

Primary inbound call-control command.

client.calls.actions.answer() — POST /calls/{call_control_id}/actions/answer

Parameter	Type	Required	Description
`call_control_id`	string (UUID)	Yes	Unique identifier and token for controlling the call
`billing_group_id`	string (UUID)	No	Use this field to set the Billing Group ID for the call.
`client_state`	string	No	Use this field to add state to every subsequent webhook.
`webhook_url`	string (URL)	No	Use this field to override the URL for which Telnyx will sen...
...			+26 optional params in references/api-details.md

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

puts(response)

Primary response fields:

response.data.result
response.data.recording_id

Transfer a live call

Common post-answer control path with downstream webhook implications.

client.calls.actions.transfer() — POST /calls/{call_control_id}/actions/transfer

Parameter	Type	Required	Description
`to`	string (E.164)	Yes	The DID or SIP URI to dial out to.
`call_control_id`	string (UUID)	Yes	Unique identifier and token for controlling the call
`timeout_secs`	integer	No	The number of seconds that Telnyx will wait for the call to ...
`client_state`	string	No	Use this field to add state to every subsequent webhook.
`webhook_url`	string (URL)	No	Use this field to override the URL for which Telnyx will sen...
...			+33 optional params in references/api-details.md

response = client.calls.actions.transfer("call_control_id", to: "+18005550100")

puts(response)

Primary response fields:

response.data.result

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

Webhooks

These webhook payload fields are inline because they are part of the primary integration path.

Call Answered

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

Call Hangup

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

Call Initiated

Field	Type	Description
`data.record_type`	enum: event	Identifies the type of the resource.
`data.event_type`	enum: call.initiated	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.connection_codecs`	string	The list of comma-separated codecs enabled for the connection.
`data.payload.offered_codecs`	string	The list of comma-separated codecs offered by caller.

If you need webhook fields that are not listed inline here, read the webhook payload reference before writing the handler.

Important Supporting Operations

Use these when the core tasks above are close to your flow, but you need a common variation or follow-up step.

Hangup call

End a live call from your webhook-driven control flow.

client.calls.actions.hangup() — POST /calls/{call_control_id}/actions/hangup

Parameter	Type	Required	Description
`call_control_id`	string (UUID)	Yes	Unique identifier and token for controlling the call
`client_state`	string	No	Use this field to add state to every subsequent webhook.
`command_id`	string (UUID)	No	Use this field to avoid duplicate commands.
`custom_headers`	array[object]	No	Custom headers to be added to the SIP BYE message.

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

puts(response)

Primary response fields:

response.data.result

Bridge calls

Trigger a follow-up action in an existing workflow rather than creating a new top-level resource.

client.calls.actions.bridge() — POST /calls/{call_control_id}/actions/bridge

Parameter	Type	Required	Description
`call_control_id`	string (UUID)	Yes	The Call Control ID of the call you want to bridge with, can...
`call_control_id`	string (UUID)	Yes	Unique identifier and token for controlling the call
`client_state`	string	No	Use this field to add state to every subsequent webhook.
`command_id`	string (UUID)	No	Use this field to avoid duplicate commands.
`video_room_id`	string (UUID)	No	The ID of the video room you want to bridge with, can't be u...
...			+16 optional params in references/api-details.md

response = client.calls.actions.bridge(
  "call_control_id",
  call_control_id_to_bridge_with: "v3:MdI91X4lWFEs7IgbBEOT9M4AigoY08M0WWZFISt1Yw2axZ_IiE4pqg"
)

puts(response)

Primary response fields:

response.data.result

Reject a call

Trigger a follow-up action in an existing workflow rather than creating a new top-level resource.

client.calls.actions.reject() — POST /calls/{call_control_id}/actions/reject

Parameter	Type	Required	Description
`cause`	enum (CALL_REJECTED, USER_BUSY)	Yes	Cause for call rejection.
`call_control_id`	string (UUID)	Yes	Unique identifier and token for controlling the call
`client_state`	string	No	Use this field to add state to every subsequent webhook.
`command_id`	string (UUID)	No	Use this field to avoid duplicate commands.

response = client.calls.actions.reject("call_control_id", cause: :USER_BUSY)

puts(response)

Primary response fields:

response.data.result

Retrieve a call status

Fetch the current state before updating, deleting, or making control-flow decisions.

client.calls.retrieve_status() — GET /calls/{call_control_id}

Parameter	Type	Required	Description
`call_control_id`	string (UUID)	Yes	Unique identifier and token for controlling the call

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

puts(response)

Primary response fields:

response.data.call_control_id
response.data.call_duration
response.data.call_leg_id
response.data.call_session_id
response.data.client_state
response.data.end_time

List all active calls for given connection

Fetch the current state before updating, deleting, or making control-flow decisions.

client.connections.list_active_calls() — GET /connections/{connection_id}/active_calls

Parameter	Type	Required	Description
`connection_id`	string (UUID)	Yes	Telnyx connection id
`page`	object	No	Consolidated page parameter (deepObject style).

page = client.connections.list_active_calls("1293384261075731461")

puts(page)

Response wrapper:

items: page.data
pagination: page.meta

Primary item fields:

call_control_id
call_duration
call_leg_id
call_session_id
client_state
record_type

List call control applications

Inspect available resources or choose an existing resource before mutating it.

client.call_control_applications.list() — GET /call_control_applications

Parameter	Type	Required	Description
`sort`	enum (created_at, connection_name, active)	No	Specifies the sort order for results.
`filter`	object	No	Consolidated filter parameter (deepObject style).
`page`	object	No	Consolidated page parameter (deepObject style).

page = client.call_control_applications.list

puts(page)

Response wrapper:

items: page.data
pagination: page.meta

Primary item fields:

id
created_at
updated_at
active
anchorsite_override
application_name

Additional Operations

Use the core tasks above first. The operations below are indexed here with exact SDK methods and required params; use references/api-details.md for full optional params, response schemas, and lower-frequency webhook payloads. Before using any operation below, read the optional-parameters section and the response-schemas section so you do not guess missing fields.

Operation	SDK method	Endpoint	Use when	Required params
Create a call control application	`client.call_control_applications.create()`	`POST /call_control_applications`	Create or provision an additional resource when the core tasks do not cover this flow.	`application_name`, `webhook_event_url`
Retrieve a call control application	`client.call_control_applications.retrieve()`	`GET /call_control_applications/{id}`	Fetch the current state before updating, deleting, or making control-flow decisions.	`id`
Update a call control application	`client.call_control_applications.update()`	`PATCH /call_control_applications/{id}`	Modify an existing resource without recreating it.	`application_name`, `webhook_event_url`, `id`
Delete a call control application	`client.call_control_applications.delete()`	`DELETE /call_control_applications/{id}`	Remove, detach, or clean up an existing resource.	`id`
SIP Refer a call	`client.calls.actions.refer()`	`POST /calls/{call_control_id}/actions/refer`	Trigger a follow-up action in an existing workflow rather than creating a new top-level resource.	`sip_address`, `call_control_id`
Send SIP info	`client.calls.actions.send_sip_info()`	`POST /calls/{call_control_id}/actions/send_sip_info`	Trigger a follow-up action in an existing workflow rather than creating a new top-level resource.	`content_type`, `body`, `call_control_id`

Other Webhook Events

Event	`data.event_type`	Description
`callBridged`	`call.bridged`	Call Bridged

For exhaustive optional parameters, full response schemas, and complete webhook payloads, see references/api-details.md.

telnyx-voice-ruby

Telnyx Voice - Ruby

Installation

Setup

More from team-telnyx/telnyx-skills

telnyx-messaging-javascript

telnyx-voice-python

telnyx-twilio-migration

telnyx-10dlc-go

telnyx-voice-conferencing-go

telnyx-account-javascript