Skip to main content
POST
/
agents
/
phone-numbers
/
provision
Provision Cartesia Number
curl --request POST \
  --url https://api.cartesia.ai/agents/phone-numbers/provision \
  --header 'Authorization: Bearer <token>' \
  --header 'Cartesia-Version: <cartesia-version>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "label": "<string>",
  "agent_id": "<string>"
}
'
{
  "id": "pn_abc123",
  "label": "Support line",
  "number": "+14155551234",
  "agent": {
    "id": "agent_abc123",
    "name": "Customer support"
  },
  "created_at": "2026-03-01T00:00:00Z",
  "updated_at": "2026-03-01T00:00:00Z"
}

Authorizations

​
Authorization
string
header
required

Cartesia API key (sk_car_...). Get one at play.cartesia.ai/keys.

Headers

​
Cartesia-Version
enum<string>
required

API version header.

Available options:
2026-03-01
Example:

"2026-03-01"

Body

application/json

Request body for provisioning a new Cartesia-managed phone number.

​
label
string
required

A human-readable name for the phone number.

​
agent_id
string

Optionally assign an agent to answer inbound calls to this number. Omit to keep the number outbound-only.

Response

Phone number provisioned.

The number supports inbound calls and outbound calls to US numbers only

​
id
string
required

Unique identifier for the phone number.

​
number
string
required

The phone number in E.164 format (e.g. +14155551234).

​
agent
object
required

The agent that answers inbound calls to this number, or null if unassigned

​
created_at
string<date-time>
required

UTC timestamp when the phone number was created.

​
updated_at
string<date-time>
required

UTC timestamp when the phone number was last updated.

​
label
string | null

A human-readable name for the phone number.