[SOLVED] Realtime SIP calls: /accept returns 200, WebSocket returns 404

Is anyone else seeing Realtime SIP incoming calls fail today?

Since around 2026-05-23 16:41 UTC , we receive realtime.call.incoming, call /v1/realtime/calls/{call_id}/accept, and get 200 OK. But immediately after, connecting to:

wss://api.openai.com/v1/realtime?call_id={call_id}

fails with:

Error during WebSocket handshake: Unexpected response code: 404

This has affected dozens of calls for us. Status page looks fine, we haven’t updated anything in our code, and the same setup has been working well for months. Is anyone else experiencing this?