Standardization and Forums

• Contribution to ETSI NFV participant since 2018; invited plenary presentation on "Network Flexibility" to the ETSI NFV#26 face-to-face Meeting in Sofia Antipolis, France, May 20-25, 2019.
• Support of 3GPP standardization on 5G Rel. 16 and Rel. 17 through industrial collaboration since 2018.
• Contribution to IETF / IRTF Network Function Virtualization Research Group (NFVRG); invited presentation to IETF 99 / IRTF NFVRG on "Using Flexibility as a Measure to Evaluate Softwarized Networks", Prague, Czech Republic, July 16-21, 2019.
• Contributions to 3GPP standardization in SA1 in the area of Mobile Traffic Management and, in particular, User Plane Congestion Notification (UPCON).
• RFC 5631: R. Shacham, H. Schulzrinne, S. Thakolsri, W. Kellerer. Session Initiation Protocol (SIP) Session Mobility , October 2009. - RFC 5631 - part of the latest SIP standard update.
• Elected Vice Chairman of WG2 (Service Architecture for the Wireless World) of the Wireless World Research Forum (WWRF) for 2004 and 2005.
• Contribution to 3GPP standardization in SA1 and SA2 in the area of Multimedia Session Continuity - for an overview on the topic see the technical study document TR 23.893
• J. Lee, H. Schulzrinne, W. Kellerer, Z. Despotovic. SIP URI Service Discovery using DNS-SD, IETF Internet Draft, SIP WG, draft-lee-sip-dns-sd-uri-02, November 2007 (I-D)
• H. Schulzrinne, R. Shacham, S. Thakolsri, W. Kellerer. Composing Presence Information. IETF Internet Draft, SIPPING WG, draft-schulzrinne-simple-composition-02, June 2006. (I-D)
• R. Shacham, H. Schulzrinne, W. Kellerer, S. Thakolsri. Specifying Media Privacy Requirements in the Session Initiation Protocol (SIP). IETF Internet Draft, SIPPING WG, draft-shacham-sip-media-privacy-02, June 2006. (I-D)