The Session Initiation Protocol (SIP) "Join" Header. - Rohan Mahy; Daniel Petrie (RFC, 2004)

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

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)

A Framework for Session Initiation Protocol User Agent Profile Delivery. - Daniel Petrie; Sumanth Channabasappa (RFC, 2011)