%% You should probably cite rfc3319 instead of this I-D.
@techreport{ietf-sip-dhcpv6-01,
    number =    {draft-ietf-sip-dhcpv6-01},
    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-sip-dhcpv6/01/},
    author =    {Bernie Volz and Henning Schulzrinne},
    title =     {{Dynamic Host Configuration Protocol (DHCPv6) Options for Session Initiation Protocol (SIP) Servers}},
    pagetotal = 7,
    year =      2002,
    month =     nov,
    day =       5,
    abstract =  {This document defines a DHCPv6 option that contains a list of domain names or IPv6 addresses that can be mapped to one or more SIP outbound proxy servers. This is one of the many methods that a SIP client can use to obtain the addresses of such a local SIP server.},
}