Control of Service Context using SIP Request-URI. - Ben Campbell; Robert J. Sparks (RFC, 2001)

SIP: Session Initiation Protocol. - Jonathan D. Rosenberg; Henning Schulzrinne; Gonzalo Camarillo; Alan B. Johnston; Jon Peterson; Robert Sparks; Mark Handley; Eve M. Schooler (RFC, 2002)

Internet Media Type message/sipfrag. - Robert Sparks (RFC, 2002)

The Session Initiation Protocol (SIP) Refer Method. - Robert J. Sparks (RFC, 2003)

Session Initiation Protocol (SIP) Basic Call Flow Examples. - Alan B. Johnston; Steve Donovan; Robert Sparks; Chris Cunningham; Kevin Summers (RFC, 2003)

Session Initiation Protocol (SIP) Public Switched Telephone Network (PSTN) Call Flows. - Alan B. Johnston; Steve Donovan; Robert Sparks; Chris Cunningham; Kevin Summers (RFC, 2003)

VoIP and IETF Standards. - Robert Sparks (LISA, 2004)

The Session Initiation Protocol (SIP) Referred-By Mechanism. - Robert J. Sparks (RFC, 2004)

VoIP. - Robert Sparks (LISA, 2005)

Session Description Protocol (SDP) Offer/Answer Examples. - Alan B. Johnston; Robert J. Sparks (RFC, 2005)

Actions Addressing Identified Issues with the Session Initiation Protocol's (SIP) Non-INVITE Transaction. - Robert J. Sparks (RFC, 2006)

Problems Identified Associated with the Session Initiation Protocol's (SIP) Non-INVITE Transaction. - Robert J. Sparks (RFC, 2006)

Session Initiation Protocol (SIP) Torture Test Messages. - Robert J. Sparks; Alan Hawrylyshen; Alan B. Johnston; Jonathan D. Rosenberg; Henning Schulzrinne (RFC, 2006)

VoIP with NATs and Firewalls. - Robert Sparks (LISA, 2007)

SIP/VoIP. - Robert Sparks (LISA, 2007)

SIP: basics and beyond. - Robert Sparks (ACM Queue, 2007)

Multiple Dialog Usages in the Session Initiation Protocol. - Robert J. Sparks (RFC, 2007)

Session Initiation Protocol (SIP) Torture Test Messages for Internet Protocol Version 6 (IPv6). - Vijay K. Gurbani; Chris Boulton; Robert J. Sparks (RFC, 2008)

Session Initiation Protocol Service Examples. - Alan B. Johnston; Robert J. Sparks; Chris Cunningham; Steve Donovan; Kevin Summers (RFC, 2008)

Addressing an Amplification Vulnerability in Session Initiation Protocol (SIP) Forking Proxies. - Robert Sparks; Scott D. Lawrence; Alan Hawrylyshen; Byron Campen (RFC, 2008)

Session Initiation Protocol (SIP) Call Control - Transfer. - Robert Sparks; Alan B. Johnston; Daniel Petrie (RFC, 2009)

Guidance on Interoperation and Implementation Reports for Advancement to Draft Standard. - Lisa Dusseault; Robert Sparks (RFC, 2009)

Change Process for the Session Initiation Protocol (SIP) and the Real-time Applications and Infrastructure Area. - Jon Peterson; Cullen Jennings; Robert Sparks (RFC, 2010)

A Call Control and Multi-Party Usage Framework for the Session Initiation Protocol (SIP). - Rohan Mahy; Robert Sparks; Jonathan D. Rosenberg; Daniel Petrie; Alan B. Johnston (RFC, 2010)

Correct Transaction Handling for 2xx Responses to Session Initiation Protocol (SIP) INVITE Requests. - Robert Sparks; Theo Zourzouvillys (RFC, 2010)

Example Call Flows Using Session Initiation Protocol (SIP) Security Mechanisms. - Cullen Jennings; Kumiko Ono; Robert Sparks; Brian Hibbard (RFC, 2011)

Requirements for Archiving IETF Email Lists and for Providing Web-Based Browsing and Searching. - Robert Sparks (RFC, 2012)

IMAP Access to IETF Email List Archives. - Robert Sparks (RFC, 2013)

Explicit Subscriptions for the REFER Method. - Robert Sparks (RFC, 2015)

Clarifications for the Use of REFER with RFC 6665. - Robert Sparks; Adam B. Roach (RFC, 2015)

Tracking Reviews of Documents. - Robert Sparks; Tero Kivinen (RFC, 2016)

Requirements for Improvements to the IETF Email List Archiving, Web-Based Browsing, and Search Tool. - Robert Sparks (RFC, 2016)

Standards News. - Christian Jacquenet; Yannick Lair; Francois Le Faucheur; Kevin J. Ma; A. Jean Mahoney; Brian Rosen; Timothy B. Terriberry; Mo Zanaty; Roni Even; Bron Gondwana; Barry Leiba; Scott Mansfield; et al. (IEEE Commun. Stand. Mag., 2017)

Clarifications for When to Use the name-addr Production in SIP Messages. - Robert Sparks (RFC, 2017)

Young children can identify knowledgeable speakers from their causal influence over listeners. - Aaron Chuey; Robert Sparks; Hyowon Gweon (CogSci, 2023)

Multiple SIP Reason Header Field Values. - Robert Sparks (RFC, 2023)