%% You should probably cite rfc5947 instead of this I-D.
@techreport{ietf-martini-reqs-09,
    number =    {draft-ietf-martini-reqs-09},
    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-martini-reqs/09/},
    author =    {John Elwell and Hadriel Kaplan},
    title =     {{Requirements for Multiple Address of Record (AOR) Reachability Information in the Session Initiation Protocol (SIP)}},
    pagetotal = 13,
    year =      2010,
    month =     jul,
    day =       26,
    abstract =  {This document states requirements for a standardized SIP registration mechanism for multiple addresses of record (AORs), the mechanism being suitable for deployment by SIP service providers on a large scale in support of small to medium sized Private Branch Exchanges (PBXs). The requirements are for a solution that can, as a minimum, support AORs based on E.164 numbers. This document is not an Internet Standards Track specification; it is published for informational purposes.},
}