%% You should probably cite rfc8433 instead of this I-D.
@techreport{worley-alert-info-fsm-06,
    number =    {draft-worley-alert-info-fsm-06},
    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/06/},
    author =    {Dale R. Worley},
    title =     {{A Simpler Method for Processing Alert-Info URNs}},
    pagetotal = 42,
    year =      2017,
    month =     feb,
    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 VoIP telephone (user agent) of the characteristics of the call that the user agent has originated or terminated. Based on the URNs in the Alert-Info header field, the user agent must select the best available signal to present to its user to indicate the characteristics of the call. This document describes a method by which 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. In many situations, the resulting FSM is simpler and faster than the selection algorithm described in {[}RFC7462{]}.},
}