%% You should probably cite rfc7890 instead of this I-D.
@techreport{ietf-p2psip-concepts-04,
    number =    {draft-ietf-p2psip-concepts-04},
    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-p2psip-concepts/04/},
    author =    {David A. Bryan and Dean Willis and Eunsoo Shim and Philip Matthews and Spencer Dawkins},
    title =     {{Concepts and Terminology for Peer to Peer SIP}},
    pagetotal = 20,
    year =      2011,
    month =     oct,
    day =       31,
    abstract =  {This document defines concepts and terminology for the use of the Session Initiation Protocol in a peer-to-peer environment where the traditional proxy-registrar and message routing functions are replaced by a distributed mechanism. These mechansims may be implemented using a distributed hash table or other distributed data mechanism with similar external properties. This document includes a high-level view of the functional relationships between the network elements defined herein, a conceptual model of operations, and an outline of the related problems addressed by the P2PSIP working group and the RELOAD protocol ({[}I-D.ietf-p2psip-base{]}, {[}I-D.ietf-p2psip-sip{]}) defined by the working group.},
}