{
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  "path": "/t/realtime-api-sip-inbound-calls-failing-again-before-webhook-dispatch/1380763?page=2#post_23",
  "publishedAt": "2026-05-18T13:20:04.000Z",
  "site": "https://community.openai.com",
  "textContent": "Hey Service Pack,\n\nThanks for the detailed call IDs. I checked the sample calls and both show /accept returning 200, but the Realtime session then errors with Missing required parameter: 'session.type'. So these specific examples do not look like a healthy accepted session where REFER silently failed.\n\nThat said, the docs say /refer should return 200 once the REFER is relayed to the SIP provider, so a 200 with no downstream REFER would not be expected. Could you retry with the current /accept payload format and share one fresh call_id if /refer still returns 200 without transfer?",
  "title": "Realtime API SIP inbound calls failing again before webhook dispatch"
}