@techreport{rosenberg-impp-presence-01,
    number =    {draft-rosenberg-impp-presence-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-impp-presence/01/},
    author =    {Jonathan Rosenberg},
    title =     {{SIP Extensions for Presence}},
    pagetotal = 39,
    year =      2001,
    month =     mar,
    day =       7,
    abstract =  {This document proposes an extension to SIP for subscriptions and notifications of user presence. User presence is defined as the willingness and ability of a user to communicate with other users on the network. Historically, presence has been limited to 'on-line' and 'off-line' indicators; the notion of presence here is broader.},
}