%% You should probably cite rfc6873 instead of this I-D.
@techreport{ietf-sipclf-format-11,
    number =    {draft-ietf-sipclf-format-11},
    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-sipclf-format/11/},
    author =    {Gonzalo Salgueiro and Vijay K. Gurbani and Adam Roach},
    title =     {{Format for the Session Initiation Protocol (SIP) Common Log Format (CLF)}},
    pagetotal = 28,
    year =      2012,
    month =     dec,
    day =       21,
    abstract =  {The SIPCLF working group has defined a Common Log Format (CLF) framework for Session Initiation Protocol (SIP) servers. This CLF mimics the successful event logging format found in well-known web servers like Apache and web proxies like Squid. This document proposes an indexed text encoding format for the SIP CLF that retains the key advantages of a text-based format while significantly increasing processing performance over a purely text-based implementation. This file format adheres to the SIP CLF information model and provides an effective encoding scheme for all mandatory and optional fields that appear in a SIP CLF record.},
}