@misc{rfc7255,
    series =    {Request for Comments},
    number =    7255,
    howpublished =  {RFC 7255},
    publisher = {RFC Editor},
    doi =       {10.17487/RFC7255},
    url =       {https://www.rfc-editor.org/info/rfc7255},
    author =    {Andrew Allen},
    title =     {{Using the International Mobile station Equipment Identity (IMEI) Uniform Resource Name (URN) as an Instance ID}},
    pagetotal = 9,
    year =      2014,
    month =     may,
    abstract =  {This specification defines how the Uniform Resource Name (URN) reserved for the Global System for Mobile Communications Association (GSMA) identities and its sub-namespace for the International Mobile station Equipment Identity (IMEI) can be used as an instance-id. Its purpose is to fulfill the requirements for defining how a specific URN needs to be constructed and used in the '+sip.instance' Contact header field parameter for outbound behavior.},
}