@techreport{ietf-enum-usage-scenarios-00,
    number =    {draft-ietf-enum-usage-scenarios-00},
    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-enum-usage-scenarios/00/},
    author =    {Steven D. Lind},
    title =     {{ENUM Usage Scenarios}},
    pagetotal = 17,
    year =      2002,
    month =     jun,
    day =       10,
    abstract =  {This document provides illustrations of the use of ENUM {[}2{]} functionality within the larger context of service-level call flows for Voice over IP communication where interworking between the PSTN and IP-based networks are necessary to complete a call. Details are presented for simple calls made on a 'direct dial' basis. Some details are also provided for calls made using the ITU-defined 'Global Services' {[}3,4,5{]}. The impact of number portability within the call scenarios is discussed. The objective of this document is to identify areas where gaps exist in the provision of services and suggest where protocol extensions for ENUM, SIP, TRIP, etc. are needed. The document does not propose that the examples represent the only or best approach for interworking between the PSTN and IP-based networks.},
}