@techreport{camarillo-sipping-early-media-02,
    number =    {draft-camarillo-sipping-early-media-02},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-camarillo-sipping-early-media/02/},
    author =    {Gonzalo Camarillo and Henning Schulzrinne},
    title =     {{Early Media and Ringback Tone Generation in the Session Initiation Protocol}},
    pagetotal = 12,
    year =      2003,
    month =     jul,
    day =       1,
    abstract =  {This document describes how to manage early media in SIP using two models; the gateway model and the application server model. It also describes which inputs need to be taken into consideration to define local policies for ringback tone generation.},
}