@techreport{jennings-sipping-multipart-02,
    number =    {draft-jennings-sipping-multipart-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-jennings-sipping-multipart/02/},
    author =    {Dan Wing and Cullen Fluffy Jennings},
    title =     {{Session Initiation Protocol (SIP) Offer/Answer with Multipart Alternative}},
    pagetotal = 14,
    year =      2006,
    month =     mar,
    day =       7,
    abstract =  {SIP needs a mechanism for general backwards compatibility for moving from SDP to SDPng or moving from non end-to-end encrypted SDP to end- to-end encrypted SDP. This document specifies how a SIP offer uses multipart/alternative, and how an answer indicates which part was selected.},
}