@techreport{roach-voip-ringtone-00,
    number =    {draft-roach-voip-ringtone-00},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-roach-voip-ringtone/00/},
    author =    {Adam Roach},
    title =     {{Ringback tones in SIP-Based Telephony}},
    pagetotal = 34,
    year =      2000,
    month =     nov,
    day =       9,
    abstract =  {This document describes a mechanism by which an appropriate ringback tone may be played to the calling party when the called party's device is alerting. It is written specifcally to address the case where the Session Initiation Protocol (SIP) is used to initiate voice-over-IP calls. It also lists ringback characteristics for several countries.},
}