@misc{rfc3601,
    series =    {Request for Comments},
    number =    3601,
    howpublished =  {RFC 3601},
    publisher = {RFC Editor},
    doi =       {10.17487/RFC3601},
    url =       {https://www.rfc-editor.org/info/rfc3601},
    author =    {Claudio Allocchio},
    title =     {{Text String Notation for Dial Sequences and Global Switched Telephone Network (GSTN) / E.164 Addresses}},
    pagetotal = 10,
    year =      2003,
    month =     sep,
    abstract =  {This memo describes the full set of notations needed to represent a text string in a Dial Sequence. A Dial Sequence is normally composed of Dual Tone Multi Frequency (DTMF) elements, plus separators and additional "actions" (such as "wait for dialtone", "pause for N secs", etc.) which could be needed to successfully establish the connection with the target service: this includes the cases where subaddresses or DTMF menu navigation apply.},
}