https://app.knowbase.one/vault/rfc/docid/4446
RFC6794: A Framework for Session Initiation Protocol (SIP) Session Policies
Internet Engineering Task Force (IETF) V. Hilt Request for Comments: 6794 Bell Labs/Alcatel-Lucent Category: Standards Track G. Camarillo ISSN: 2070-1721 Ericsson ...
https://app.knowbase.one/vault/rfc/docid/4588
RFC4189: Requirements for End-to-Middle Security for the Session Initiation Protocol (SIP)
Network Working Group K. Ono Request for Comments: 4189 S. Tachimoto Category: Informational NTT Corporation October 2005 ...