---
title: "Changes to Establish a WebRTC leg via SDP offer/answer"
method: POST
path: "/webrtc/offer"
---

# Changes to Establish a WebRTC leg via SDP offer/answer

`POST /webrtc/offer`

> Every recorded change to this endpoint, newest first.

## Timeline

Changed in 5 of 67 revisions.

- **2026-09-01** `89ff267f0958` — 1 info
- **2026-07-14** `1cf212b29f4e` — 1 info
- **2026-05-11** `7ab34b92424f` — 1 breaking, 1 warning, 2 info
- **2026-03-26** `d09c97c6ca8c` — 1 warning, 1 info
- **2026-03-26** `818619c99a1d` — 2 breaking, 1 info

## Changes

- **2026-09-01** `89ff267f0958` — 1 info
  - added the new optional request property `custom_data`
- **2026-07-14** `1cf212b29f4e` — 1 info
  - added the new optional request property `app_id`
- **2026-05-11** `7ab34b92424f` — 1 breaking, 1 warning, 2 info
  - removed the required property `status` from the response with the `200` status
  - removed the optional property `instance_id` from the response with the `200` status
  - added the required property `leg_id` to the response with the `200` status
  - added the required property `sdp` to the response with the `200` status
- **2026-03-26** `d09c97c6ca8c` — 1 warning, 1 info
  - removed the request property `app_id`
  - added the optional property `instance_id` to the response with the `200` status
- **2026-03-26** `818619c99a1d` — 2 breaking, 1 info
  - removed the required property `leg_id` from the response with the `200` status
  - removed the required property `sdp` from the response with the `200` status
  - added the required property `status` to the response with the `200` status

---

[Operation](https://skmtc.dev/voiceblender/apis/voiceblender-api/docs/webrtc/offer/post.md) · [API](https://skmtc.dev/voiceblender/apis/voiceblender-api.md) · [Page](https://skmtc.dev/voiceblender/apis/voiceblender-api/changes/webrtc/offer/post)