---
title: "Transfer an active SIP call to a new destination using the SIP REFER verb."
method: POST
path: "/realtime/calls/{call_id}/refer"
tags: ["Realtime"]
---

# Transfer an active SIP call to a new destination using the SIP REFER verb.

`POST /realtime/calls/{call_id}/refer`

## Path parameters

- `call_id` string, required

## Request body

- RealtimeCallReferRequest — Parameters required to transfer a SIP call to a new destination using the Realtime API.
  - `target_uri` string, required — URI that should appear in the SIP Refer-To header. Supports values like `tel:+14155550123` or `sip:agent@example.com`.

## Response `200`

Call referred successfully.

## Changes

- **2026-05-13** `74cbcf73838f` — 1 info
  - endpoint added
- **2024-08-23** `5856f8b0c850` — 1 breaking
  - api path removed without deprecation

[Change history](https://skmtc.dev/openai/apis/openapi/changes/realtime/calls/:call_id/refer/post.md)

---

[API](https://skmtc.dev/openai/apis/openapi.md) · [All operations](https://skmtc.dev/openai/apis/openapi/llms.txt) · [OpenAPI document](https://skmtc.dev/openai/apis/openapi/revisions/bb9b3b410112?raw)