@misc{rfc4458,
    series =    {Request for Comments},
    number =    4458,
    howpublished =  {RFC 4458},
    publisher = {RFC Editor},
    doi =       {10.17487/RFC4458},
    url =       {https://www.rfc-editor.org/info/rfc4458},
    author =    {Cullen Fluffy Jennings and John Elwell and Francois Audet},
    title =     {{Session Initiation Protocol (SIP) URIs for Applications such as Voicemail and Interactive Voice Response (IVR)}},
    pagetotal = 21,
    year =      2006,
    month =     apr,
    abstract =  {The Session Initiation Protocol (SIP) is often used to initiate connections to applications such as voicemail or interactive voice recognition systems. This specification describes a convention for forming SIP service URIs that request particular services based on redirecting targets from such applications. This memo provides information for the Internet community.},
}