@techreport{ietf-sipcore-proxy-feature-reqs-03,
    number =    {draft-ietf-sipcore-proxy-feature-reqs-03},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-ietf-sipcore-proxy-feature-reqs/03/},
    author =    {Christer Holmberg and Ivo Sedlacek},
    title =     {{Requirements for indication of features supported by a SIP proxy}},
    pagetotal = 9,
    year =      2011,
    month =     dec,
    day =       5,
    abstract =  {The Session Initiation Protocol (SIP) "Caller Preferences" extension defined in RFC 3840 provides a mechanism that allows a SIP message to convey information relating to the originator's supported features/ capabilities. This document defines requirements for a mechanism that would allow SIP proxies to convey information relating to the proxy's supported features/capabilities.},
}