---
title: "Decline an incoming SIP call by returning a SIP status code to the caller."
method: POST
path: "/realtime/calls/{call_id}/reject"
tags: ["Realtime"]
---

# Decline an incoming SIP call by returning a SIP status code to the caller.

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

## Path parameters

- `call_id` string, required

## Request body

- RealtimeCallRejectRequest — Parameters used to decline an incoming SIP call handled by the Realtime API.
  - `status_code` integer — SIP response code to send back to the caller. Defaults to `603` (Decline) when omitted.

## Response `200`

Call rejected successfully.

## Changes

> 82 revisions in range; 16 could not be searched.

- **2026-05-13** `74cbcf73838f` — 1 info
  - endpoint added

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

---

[API](https://skmtc.dev/openai/apis/openapi.md) · [All operations](https://skmtc.dev/openai/apis/openapi/llms.txt) · [OpenAPI document](https://skmtc-service-production.skmtc.workers.dev/v1/apis/openai/openapi/revisions/959ef977e135/schema)