https://app.knowbase.one/vault/rfc/docid/5517
RFC5057: Multiple Dialog Usages in the Session Initiation Protocol
Network Working Group R. Sparks Request for Comments: 5057 Estacado Systems Category: Informational November 2007 Multiple Dialog Usages in the Session Initiation Protocol Status ...
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 ...