H.323 Uniform Resource Locator (URL) Scheme Registration. - Orit Levin (RFC, 2003)

Telephone Number Mapping (ENUM) Service Registration for H.323. - Orit Levin (RFC, 2004)

High-Level Requirements for Tightly Coupled SIP Conferencing. - Orit Levin; Roni Even (RFC, 2005)

Suppression of Session Initiation Protocol (SIP) REFER Method Implicit Subscription. - Orit Levin (RFC, 2006)

Conveying Feature Tags with the Session Initiation Protocol (SIP) REFER Method. - Orit Levin; Alan B. Johnston (RFC, 2006)

The Session Description Protocol (SDP) Label Attribute. - Orit Levin; Gonzalo Camarillo (RFC, 2006)

A Session Initiation Protocol (SIP) Event Package for Conference State. - Jonathan D. Rosenberg; Henning Schulzrinne; Orit Levin (RFC, 2006)

Session Initiation Protocol (SIP) Call Control - Conferencing for User Agents. - Alan B. Johnston; Orit Levin (RFC, 2006)

XML Schema for Media Control. - Orit Levin; Roni Even; Pierre Hagendorf (RFC, 2008)

A Framework for Centralized Conferencing. - Mary Barnes; Chris Boulton; Orit Levin (RFC, 2008)

Subscriptions to Request-Contained Resource Lists in the Session Initiation Protocol (SIP). - Gonzalo Camarillo; Adam B. Roach; Orit Levin (RFC, 2008)