%% You should probably cite draft-ietf-mmusic-sdp-source-attributes instead of this I-D.
@techreport{lennox-mmusic-sdp-source-attributes-01,
    number =    {draft-lennox-mmusic-sdp-source-attributes-01},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-lennox-mmusic-sdp-source-attributes/01/},
    author =    {Jonathan Lennox},
    title =     {{Source-Specific Media Attributes in the Session Description Protocol (SDP)}},
    pagetotal = 17,
    year =      2007,
    month =     jul,
    day =       8,
    abstract =  {The Session Description Protocol provides mechanisms to describe attributes of multimedia sessions and of individual media streams (e.g., Real-time Transport Protocol (RTP) sessions) within a multimedia session, but does not provide any mechanism to describe individual media sources within a media stream. This document defines a mechanism to describe RTP media sources, identified by their Synchronization Source Identifiers (SSRCs), in SDP, associate attributes with these sources, and express relationships among sources. It also defines several source-level attributes which can be used to describe properties of media sources.},
}