@techreport{rosenberg-sip-call-package-01,
    number =    {draft-rosenberg-sip-call-package-01},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-rosenberg-sip-call-package/01/},
    author =    {Jonathan Rosenberg and Henning Schulzrinne},
    title =     {{SIP Event Packages for Call Leg and Conference State}},
    pagetotal = 23,
    year =      2002,
    month =     mar,
    day =       7,
    abstract =  {This document defines two new event packages for the SIP Events architecture, along with two new data formats used in notifications for those packages. The first is a call-leg package, and the second is a conference package. The call-leg package allows users to subscribe to another user, an receive notifications about the changes in state of call legs that the user is involved in.},
}