https://app.knowbase.one/vault/rfc/docid/4888
RFC4479: A Data Model for Presence
Network Working Group J. Rosenberg Request for Comments: 4479 Cisco Systems Category: Standards Track July 2006 A Data Model for Presence Status of This Memo ...
https://app.knowbase.one/vault/rfc/docid/7481
RFC6869: vCard KIND:device
Internet Engineering Task Force (IETF) G. Salgueiro Request for Comments: 6869 J. Clarke Category: Standards Track P. Saint-Andre ISSN: 2070-1721 Cisco Systems ...