@misc{rfc4040,
    series =    {Request for Comments},
    number =    4040,
    howpublished =  {RFC 4040},
    publisher = {RFC Editor},
    doi =       {10.17487/RFC4040},
    url =       {https://www.rfc-editor.org/info/rfc4040},
    author =    {Ruediger Kreuter},
    title =     {{RTP Payload Format for a 64 kbit/s Transparent Call}},
    pagetotal = 8,
    year =      2005,
    month =     apr,
    abstract =  {This document describes how to carry 64 kbit/s channel data transparently in RTP packets, using a pseudo-codec called "Clearmode". It also serves as registration for a related MIME type called "audio/clearmode". "Clearmode" is a basic feature of VoIP Media Gateways. {[}STANDARDS-TRACK{]}},
}