Documents by J. Elwell
2006, RFC4458: Session Initiation Protocol (SIP) URIs for Applications such as Voicemail and Interactive Voice Response (IVR)
2007, RFC4916: Connected Identity in the Session Initiation Protocol (SIP)
2010, RFC5947: Requirements for Multiple Address of Record (AOR) Reachability Information in the Session Initiation Protocol (SIP)
2010, RFC6011: Session Initiation Protocol (SIP) User Agent Configuration