@misc{rfc8119,
    series =    {Request for Comments},
    number =    8119,
    howpublished =  {RFC 8119},
    publisher = {RFC Editor},
    doi =       {10.17487/RFC8119},
    url =       {https://www.rfc-editor.org/info/rfc8119},
    author =    {Marianne Mohali and Mary Barnes},
    title =     {{SIP "cause" URI Parameter for Service Number Translation}},
    pagetotal = 12,
    year =      2017,
    month =     mar,
    abstract =  {RFC 4458 (regarding SIP URIs for applications) defines a "cause" URI parameter, which may appear in the Request-URI of a SIP request, that is used to indicate a reason why the request arrived to the User Agent Server (UAS) receiving the message. This document updates RFC 4458 by creating a new predefined value for the "cause" URI parameter to cover service number translation for cases of retargeting due to specific service action leading to the translation of a called service access number. This document also provides guidance, which was missing in RFC 4458, for using the "cause" URI parameter within the History-Info header field, since this use is mandatory in some IP networks' implementations.},
}