@techreport{ietf-sip-service-examples-03,
    number =    {draft-ietf-sip-service-examples-03},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-ietf-sip-service-examples/03/},
    author =    {Robert Sparks and Steve Donovan and Chris Cunningham},
    title =     {{SIP Service Examples}},
    pagetotal = 107,
    year =      2001,
    month =     nov,
    day =       27,
    abstract =  {This informational document gives examples of SIP (Session Initiation Protocol) services. This covers most features offered in so-called Centrex offerings from local exchange carriers and PBX (Private Branch Exchange) features.},
}