%% You should probably cite rfc6904 instead of this I-D.
@techreport{ietf-avtcore-srtp-encrypted-header-ext-01,
    number =    {draft-ietf-avtcore-srtp-encrypted-header-ext-01},
    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-avtcore-srtp-encrypted-header-ext/01/},
    author =    {Jonathan Lennox},
    title =     {{Encryption of Header Extensions in the Secure Real-Time Transport Protocol (SRTP)}},
    pagetotal = 13,
    year =      2011,
    month =     oct,
    day =       28,
    abstract =  {The Secure Real-Time Transport Protocol (SRTP) provides authentication, but not encryption, of the headers of Real-Time Transport Protocol (RTP) packets. However, RTP header extensions may carry sensitive information for which participants in multimedia sessions want confidentiality. This document provides a mechanism, extending the mechanisms of SRTP, to selectively encrypt RTP header extensions in SRTP.},
}