[5] “SIP URIs for Applications such as Voicemail and Interactive Voice” C. Jen-
nings et al. Internet Draft, IETF, November 2005.
[6] “An Extension to the Session Initiation Protocol (SIP) for Request History
Information” by M. Barnes. RFC 4244, IETF, November 2005.
[7] “SIP-Specific Event Notification” by A. Roach. RFC 3265, IETF, June 2002.
[8] “A Message Summary and Message Waiting Indication Event Package for
SIP” by R. Mahy. RFC 3842, IETF, August 2004.
[9] “SIP Extensions for Message Waiting Indication” by R. Mahy and I. Slain.
Expired Internet Draft, IETF, July 2000.222 Chapter 12