---
title: "Provision Cartesia Number"
method: POST
path: "/agents/phone-numbers/provision"
tags: ["Phone Numbers"]
---

# Provision Cartesia Number

`POST /agents/phone-numbers/provision`

Provision a new Cartesia-managed US phone number

## Headers

- `Cartesia-Version` '2026-03-01', date, required

## Request body

- ProvisionPhoneNumberBody — 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 `201`

Phone number provisioned.

- ProvisionPhoneNumberResponse — Common phone number fields.
  - `id` string, required — Unique identifier for the phone number.
  - `label` string, nullable — A human-readable name for the phone number.
  - `number` string, required — The phone number in E.164 format (e.g. +14155551234).
  - `agent` object, nullable, required — The agent that answers inbound calls to this number, or `null` if unassigned
    - `id` string, required
    - `name` string, required
  - `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.

## Other responses

- `402` — Subscription phone number limit reached (`error_code: quota_exceeded`). Upgrade your plan or delete existing Cartesia numbers.
- `404` — Agent not found.

---

[API](https://skmtc.net/cartesia/apis/cartesia-api.md) · [All operations](https://skmtc.net/cartesia/apis/cartesia-api/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/cartesia/cartesia-api/revisions/8910812440d3/schema)