https://app.knowbase.one/vault/rfc/docid/4438
RFC4032: Update to the Session Initiation Protocol (SIP) Preconditions Framework
Network Working Group G. Camarillo Request for Comments: 4032 Ericsson Updates: 3312 P. Kyzivat Category: Standards Track Cisco Systems ...
https://app.knowbase.one/vault/rfc/docid/6145
RFC5631: Session Initiation Protocol (SIP) Session Mobility
Network Working Group R. Shacham Request for Comments: 5631 H. Schulzrinne Category: Informational Columbia University S. Thakolsri ...