{
  "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": "Twilio",
      "title": "Introduction to Webhooks",
      "url": "https://www.twilio.com/docs/usage/webhooks"
    },
    {
      "kind": "Twilio",
      "title": "Programmable Voice",
      "url": "https://www.twilio.com/docs/voice"
    },
    {
      "kind": "Bandwidth",
      "title": "Bandwidth Messaging API",
      "url": "https://dev.bandwidth.com/docs/messaging/"
    },
    {
      "kind": "Wikipedia",
      "title": "SIP trunking",
      "url": "https://en.wikipedia.org/wiki/SIP_trunking"
    },
    {
      "kind": "Confirm",
      "title": "A captured transfer ladder. confirm.",
      "url": null
    },
    {
      "kind": "Confirm",
      "title": "Twilio Media Streams message fields. confirm.",
      "url": null
    }
  ]
}