https://app.knowbase.one/vault/rfc/docid/2226
RFC1996: A Mechanism for Prompt Notification of Zone Changes (DNS NOTIFY)
Network Working Group P. Vixie Request for Comments: 1996 ISC Updates: 1035 August 1996 Category: Standards Track A Mechanism for Prompt Notification of Zone...
https://app.knowbase.one/vault/rfc/docid/7252
RFC6665: SIP-Specific Event Notification
Internet Engineering Task Force (IETF) A.B. Roach Request for Comments: 6665 Tekelec Obsoletes: 3265 July 2012 Updates: 3261, 4660 Category: Standards Track ISSN: 2070-1721 ...