---
title: "Create a new Realtime API call over WebRTC and receive the SDP answer needed
to complete the peer connection."
method: POST
path: "/realtime/calls"
tags: ["Realtime"]
---

# Create a new Realtime API call over WebRTC and receive the SDP answer needed
to complete the peer connection.

`POST /realtime/calls`

## Response `201`

Realtime call created successfully.

## Changes

> 82 revisions in range; 11 could not be searched.

- **2026-08-05** `ab0c5306e390` — 12 info
  - added the new optional request property `session/allOf[subschema #1: Realtime session configuration]/audio/input/transcription/keywords`
  - added the new optional request property `session/allOf[subschema #1: Realtime session configuration]/audio/input/transcription/languages`
  - added the new optional request property `session/allOf[subschema #1: Realtime session configuration]/prompt/anyOf[subschema #1]/variables/anyOf[subschema #1: Prompt Variables]/additionalProperties/oneOf[subschema #2: Input text]/prompt_cache_breakpoint`
  - added the new optional request property `session/allOf[subschema #1: Realtime session configuration]/prompt/anyOf[subschema #1]/variables/anyOf[subschema #1: Prompt Variables]/additionalProperties/oneOf[subschema #3: Input image]/prompt_cache_breakpoint`
  - …8 more
- **2026-05-13** `74cbcf73838f` — 1 info
  - endpoint added

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