https://app.knowbase.one/vault/rfc/docid/6139
RFC5626: Managing Client-Initiated Connections in the Session Initiation Protocol (SIP)
Network Working Group C. Jennings, Ed. Request for Comments: 5626 Cisco Systems Updates: 3261, 3327 R. Mahy, Ed. Category: Standards Track Unaffiliated ...
https://app.knowbase.one/vault/rfc/docid/6771
RFC6223: Indication of Support for Keep-Alive
Internet Engineering Task Force (IETF) C. Holmberg Request for Comments: 6223 Ericsson Category: Standards Track April 2011 ISSN: 2070-1721 Indication of Support for Keep-Alive A...