{
  "opened": "2026-10",
  "sources": [
    {
      "kind": "RFC",
      "title": "RFC 3261, SIP",
      "url": "https://www.rfc-editor.org/rfc/rfc3261"
    },
    {
      "kind": "RFC",
      "title": "RFC 3550, RTP",
      "url": "https://www.rfc-editor.org/rfc/rfc3550"
    },
    {
      "kind": "Wikipedia",
      "title": "Session Initiation Protocol",
      "url": "https://en.wikipedia.org/wiki/Session_Initiation_Protocol"
    },
    {
      "kind": "Confirm",
      "title": "Vendor call-flow poster. confirm. Not opened for Zoom, Talkdesk, or Avaya.",
      "url": null
    }
  ]
}