%% You should probably cite rfc8433 instead of this I-D.
@techreport{worley-alert-info-fsm-10,
    number =    {draft-worley-alert-info-fsm-10},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-worley-alert-info-fsm/10/},
    author =    {Dale R. Worley},
    title =     {{A Simpler Method for Resolving Alert-Info URNs}},
    pagetotal = 45,
    year =      2018,
    month =     apr,
    day =       20,
    abstract =  {The "alert" namespace of Uniform Resource Names (URNs) can be used in the Alert-Info header field of Session Initiation Protocol (SIP) requests and responses to inform a voice over IP (VoIP) telephone (user agent) of the characteristics of the call that the user agent has originated or terminated. The user agent must resolve the URNs into a signal; that is, it must select the best available signal to present to its user to indicate the characteristics of the call. RFC 7462 describes a non-normative algorithm for signal selection. This document describes a more efficient alternative algorithm: a user agent's designer can, based on the user agent's signals and their meanings, construct a finite state machine (FSM) to process the URNs to select a signal in a way that obeys the restrictions given in the definition of the "alert" URN namespace.},
}