@misc{rfc3455,
    series =    {Request for Comments},
    number =    3455,
    howpublished =  {RFC 3455},
    publisher = {RFC Editor},
    doi =       {10.17487/RFC3455},
    url =       {https://www.rfc-editor.org/info/rfc3455},
    author =    {Duncan Mills and Eric Henrikson and Miguel Angel García},
    title =     {{Private Header (P-Header) Extensions to the Session Initiation Protocol (SIP) for the 3rd-Generation Partnership Project (3GPP)}},
    pagetotal = 34,
    year =      2003,
    month =     jan,
    abstract =  {This document describes a set of private Session Initiation Protocol (SIP) headers (P-headers) used by the 3rd-Generation Partnership Project (3GPP), along with their applicability, which is limited to particular environments. The P-headers are for a variety of purposes within the networks that the partners use, including charging and information about the networks a call traverses. This memo provides information for the Internet community.},
}