@techreport{rosenberg-sip-entfw-02,
    number =    {draft-rosenberg-sip-entfw-02},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-rosenberg-sip-entfw/02/},
    author =    {Jonathan Rosenberg and Joel Weinberger and Henning Schulzrinne},
    title =     {{NAT Friendly SIP}},
    pagetotal = 32,
    year =      2001,
    month =     jul,
    day =       24,
    abstract =  {In this draft, we discuss how SIP can traverse enterprise and residential firewalls and NATs. This environment is challenging because we assume here that the end user has little or no control over the firewall or NAT, and that the firewall or NAT is completely ignorant of SIP},
}