Documents by D. Willis
2002, RFC3327: Session Initiation Protocol (SIP) Extension Header Field for Registering Non-Adjacent Contacts
2002, RFC3427: Change Process for the Session Initiation Protocol (SIP)
2003, RFC3608: Session Initiation Protocol (SIP) Extension Header Field for Service Route Discovery During Registration
2006, RFC4453: Requirements for Consent-Based Communications in the Session Initiation Protocol (SIP)
2008, RFC5360: A Framework for Consent-Based Communications in the Session Initiation Protocol (SIP)
2010, RFC5839: An Extension to Session Initiation Protocol (SIP) Events for Conditional Event Notification
2010, RFC5875: An Extensible Markup Language (XML) Configuration Access Protocol (XCAP) Diff Event Package
2016, RFC7890: Concepts and Terminology for Peer-to-Peer SIP (P2PSIP)