@misc{rfc7273,
    series =    {Request for Comments},
    number =    7273,
    howpublished =  {RFC 7273},
    publisher = {RFC Editor},
    doi =       {10.17487/RFC7273},
    url =       {https://www.rfc-editor.org/info/rfc7273},
    author =    {Aidan Williams and Kevin Gross and Ray van Brandenburg and Hans Stokking},
    title =     {{RTP Clock Source Signalling}},
    pagetotal = 30,
    year =      2014,
    month =     jun,
    abstract =  {NTP format timestamps are used by several RTP protocols for synchronisation and statistical measurements. This memo specifies Session Description Protocol (SDP) signalling that identifies timestamp reference clock sources and SDP signalling that identifies the media clock sources in a multimedia session.},
}