---
title: "Reject a parked inbound REGISTER attempt"
method: POST
path: "/sip/registrations/attempts/{id}/reject"
tags: ["SIP Registrations"]
---

# Reject a parked inbound REGISTER attempt

`POST /sip/registrations/attempts/{id}/reject`

Replies with a non-2xx (403 Forbidden by default; override via `code`/`reason`) for an inbound REGISTER surfaced via the `sip.registration_attempt` event (by its `attempt_id`).

## Request body

- RegistrationRejectRequest
  - `code` integer
  - `reason` string

## Response `202`

Reject queued

## Other responses

- `404` — Registration attempt not found or already decided

## Changes

- **2026-07-04** `8e2966a803c8` — 1 info
  - endpoint added

[Change history](https://skmtc.dev/voiceblender/apis/voiceblender-api/changes/sip/registrations/attempts/:id/reject/post.md)

---

[API](https://skmtc.dev/voiceblender/apis/voiceblender-api.md) · [All operations](https://skmtc.dev/voiceblender/apis/voiceblender-api/llms.txt) · [OpenAPI document](https://skmtc.dev/voiceblender/apis/voiceblender-api/revisions/9b0a18aea1e2?raw)