---
title: "Attach phone numbers to an outbound agent"
method: PUT
path: "/assistants/{model_id}/phone_numbers"
tags: [""]
---

# Attach phone numbers to an outbound agent

`PUT /assistants/{model_id}/phone_numbers`

Attach multiple outbound phone numbers to an agent by phone numbers or by slugs.

## Path parameters

- `model_id` string, required — Agent ID. You can find it on the agent’s page in your dashboard.

## Headers

- `Authorization` string, required

## Request body

- union
  - AttachPhoneNumbersToAssistantRequest0
    - `phone_numbers` string[], required — Phone numbers array.
  - AttachPhoneNumbersToAssistantRequest1
    - `phone_number_slugs` string[], required — Phone number slugs.

## Response `200`

200

- AttachPhoneNumbersToAssistantResponse200
  - `status` string

## Other responses

- `404` — 404

---

[API](https://skmtc.net/synthflow/apis/platform-api.md) · [All operations](https://skmtc.net/synthflow/apis/platform-api/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/synthflow/platform-api/versions/decb652b52e0/schema)