{
  "opened": "2026-10",
  "sources": [
    {
      "kind": "Wikipedia",
      "title": "E.164",
      "url": "https://en.wikipedia.org/wiki/E.164"
    },
    {
      "kind": "Wikipedia",
      "title": "SMS",
      "url": "https://en.wikipedia.org/wiki/Short_Message_Service"
    },
    {
      "kind": "Bandwidth",
      "title": "Bandwidth Messaging API",
      "url": "https://dev.bandwidth.com/docs/messaging/"
    },
    {
      "kind": "Plivo",
      "title": "Plivo WhatsApp prerequisites",
      "url": "https://www.plivo.com/docs/messaging/concepts/whatsapp/prerequisites"
    },
    {
      "kind": "IANA",
      "title": "IANA SIP parameters",
      "url": "https://www.iana.org/assignments/sip-parameters/sip-parameters.xhtml"
    },
    {
      "kind": "Vonage",
      "title": "Vonage Voice API",
      "url": "https://developer.vonage.com/en/voice/voice-api/overview"
    },
    {
      "kind": "Confirm",
      "title": "A MOS or G.114 millisecond budget. confirm.",
      "url": null
    },
    {
      "kind": "Confirm",
      "title": "Any vendor price not in the list above. confirm.",
      "url": null
    }
  ]
}