---
title: "Send 180 Ringing on a ringing inbound SIP leg (asynchronous)"
method: POST
path: "/legs/{id}/ring"
tags: ["Legs"]
---

# Send 180 Ringing on a ringing inbound SIP leg (asynchronous)

`POST /legs/{id}/ring`

Queues a SIP 180 Ringing provisional response with no SDP. Use when `SIP_AUTO_RINGING=false` (the default) and you want to indicate alerting before deciding to early-media or answer. Idempotent: each call emits another 180 — receivers tolerate re-sends. The HTTP call returns 202 as soon as the request is validated; SIP-level send failures surface as `leg.command_failed` with `command="ring"`.

## Request body

- RingLegRequest
  - `custom_data` unknown

## Response `202`

180 Ringing queued

## Other responses

- `400` — Not a SIP inbound leg, or custom_data over the size limit
- `404` — Leg not found
- `409` — Leg is not in ringing state

## Changes

- **2026-09-01** `89ff267f0958` — 1 info
  - added optional request body
- **2026-05-08** `20957badcc90` — 1 info
  - endpoint added
- **2026-03-26** `d09c97c6ca8c` — 1 breaking
  - api path removed without deprecation

[Change history](https://skmtc.dev/voiceblender/apis/voiceblender-api/changes/legs/:id/ring/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-service-production.skmtc.workers.dev/v1/apis/voiceblender/voiceblender-api/revisions/89ff267f0958/schema)