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

# Provision Cartesia Number

`POST /agents/phone-numbers/provision`

## Request

- Base URL: `https://api.cartesia.ai`
- URL: `https://api.cartesia.ai/agents/phone-numbers/provision`
- Auth: HTTP bearer
- TypeScript: <https://skmtc.dev/cartesia/apis/cartesia-api/docs/agents/phone-numbers/provision/post.ts> (a function with typed inputs; its response is checked against the schema)

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.dev/cartesia/apis/cartesia-api.md) - [All operations](https://skmtc.dev/cartesia/apis/cartesia-api/llms.txt) - [OpenAPI document](https://skmtc.dev/cartesia/apis/cartesia-api/revisions/8910812440d3?raw)