# GET /v1/convai/phone-numbers (ElevenLabs API)
Base URL: https://api.elevenlabs.io
Auth: xi-api-key: <ELEVENLABS_API_KEY>
Last verified: 2026-09-03

> List Phone Numbers

## Critical Gotchas
* Authentication uses the non-standard `xi-api-key` header, not `Authorization: Bearer`. Sending a Bearer token returns HTTP 401.
* Text-to-speech responses are raw binary audio, not JSON. Write the body to a file (`--output speech.mp3`) rather than parsing it.

## cURL
curl -X GET 'https://api.elevenlabs.io/v1/convai/phone-numbers?provider=twilio&agent_id=agent-id&branch_id=branch-id' \
  -H "xi-api-key: $ELEVENLABS_API_KEY"

## Parameters
| Name | In | Type | Required | Description |
| :--- | :--- | :--- | :--- | :--- |
| provider | query | string | No | Filter by telephony provider |
| agent_id | query | string | No | Filter by assigned agent ID |
| branch_id | query | string | No | Filter by assigned branch ID |

## Response (200 OK)
[{"label":"Customer Support","phone_number":"+1234567890"}]

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