draft-ietf-enum-operation-02.txt

bind-3.2.

 
 
7.2 Example: SIP Call Setup Service Request 
    
   This example provides resolution of a telephone number to the 
   identifier for the SIP gatekeeper designated to support real-time 
   calling (Sipphonecall) to 972 555 1313.  The telephone number is 
   part of a block of ported telephone numbers that have been ported 
   out of the donor carriers block to another carrier. 
    
   The telephone number is transformed into a domain name form to be 
   used in a DNS query.   
    
   Sample configuration file for the top tier delegations from ITU: 
    
        1.e164.arpa.     IN NS  ns.NANP.phone.net.  ;for NANP 
        3.3.e164.arpa.   IN NS  ns.FR.phone.net.  ; for France 
        2.7.9.e164.arpa. IN NS  ns.il.phone.net. ; for Israel 
    
   Sample DNS configuration file for the ported number block serviced 
   by the 972 555 number portability authority delegated from the NANP 
   node in the DNS tree:  
    
       5.5.5.2.7.9.1.e164.arpa.  IN NS ns.972555Port.NANP.phone.net. 
                                          ;for 972 555 
    
   The number portability authority manages the delegation on a per-
   telephone number basis.  Logically, the ns.972555Port.NANP.phone.net 
   has the following record for the telephone number. 
    
       3.1.3.1.5.5.5.2.7.9.1.e164.arpa.  IN NS ns.ServiceProviderB.net. 
                                          ;for 972 555 1313 
    
   ServiceProviderB provides service registrar functions directly for 
   the telephone number.  The following configuration entry is provided 
   for [phone]. 
    
    
      3.1.3.1.5.5.2.7.9.1.ServiceProviderB.net.   
                  IN NAPTR 10 10 "u" "sip+E2U"\ 
               "!^.*$!sip:[e-mail]!" . 
   The DNS Query and response using telephone number [phone]: 
    
        QueryType: NAPTR 
        QueryName: 3.1.3.1.5.5.5.2.7.9.1.e164.arpa 
        Result:  
           IN NAPTR  10 10 "u" "sip+E2U" \ 
               "!^.*$!sip:[e-mail]!"   . 
         
   The client can now use the SIP protocols to contact the SIP gateway 
   to initiate a phone call. 
 
 








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8. Security Considerations 
    
   The following are known security issues taken into consideration in 
   the definition of this directory service. 
         
     1.        Service provider customer information is very sensitive, 
       especially in this time of local phone competition.  Service 
       providers require the maximum flexibility to protect this data.  
         
     2.        Registration of a domain name for the telephone numbers 
       delegated to another carrier may result in messages being 
       misdirected to the wrong carrier.  As subdelegations are 
       implemented, the risk that phone numbers delegated to one 
       enterprise may be incorrectly pointed at another will increase. 
         
     3.        Service providers operate in a regulated environment where 
       certain information about subscribers must not be disclosed.  
       Telephony services and Voice Messaging are subject to caller-ID 
       blocking restrictions, restrictions normally enforced in the 
       telephony network.  No such protection is available on the 
       Internet.  The protection of this data is essential, but is up 
       to the individual service providers to not disclose this 
       information outside of their control. 
 



































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9. References 
    
   [DNS1] Mockapetris, P., "Domain names - implementation and 
   specification", RFC1035, Nov 1987. 
    
   [DNS2] Mockapetris, P., "Domain names - concepts and facilities", 
   RFC 1034, Nov 1987. 
    
   [SRV] Arnt Gulbrandsen, Paul Vixie, Levon Esibov, "A DNS RR for 
   specifying the location of services (DNS SRV)", Work in Progress  
    
   [E164] ITU, "CCITT Recommendation E.164 (1991), Telephone Network 
   and ISDN Operation, Numbering, Routing and  Mobile Service - 
   Numbering Plan for the ISDN Era."   
    
   [TPC1] Malamud, Carl, Rose, Marshall, "Principles of Operation for 
   the TPC.INT Subdomain: Remote Printing -- Technical Procedures", RFC 
   1530, October 1993. 
    
   [VPIM2] Vaudreuil, Greg, Parsons, Glen, "Voice Profile for Internet 
   Mail, Version 2", RFC 2421, September 1998. 
    
   [SRV] Gulbrandsen, A., Vixie, P., "A DNS RR for specifying the 
   location of services (DNS SRV)", RFC 2052, October 1996. 
    
   [REQ] Brown, Anne, "ENUM Requirements", work-in-progress, November 
   1999  
    
   [ENUM] Faltstrom, Patrick, "E.164 number and DNS", RFC 2916, 
   September 2000. 
 
   [NAPTR] M. Mealling, R. Daniel _The Naming Authority Pointer (NAPTR) 
   DNS Resource Record_, RFC 2915, September 2000. 
    
   [PORT] M. Foster, T. McGarry, j. Yu, _Number Portability in the 
   GSTN: An Overview_, Work-in-Progress, July 2000. 
 
10. Acknowledgments 
    
11. Author's Addresses 
    
   Anne R. Brown 
   Nortel Networks 
   P.O. Box 3511, Station C 
   Ottawa, ON  K1Y 4H7 
   Canada 
   Phone: [phone] 
   Fax: [phone] 
   Email: [e-mail] 
    
   Gregory M. Vaudreuil 
   Lucent Technologies,  
   Communications Application Group 
   17080 Dallas Parkway 
   Dallas, TX  75248-1905 
   United States 
   Phone/Fax: [phone] 
   Email: [e-mail] 

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12. Full Copyright Statement                             

   "Copyright (C) The Internet Society (2001). All Rights Reserved. 
   This document and translations of it may be copied and furnished to 
   others, and derivative works that comment on or otherwise explain it 
   or assist in its implementation may be prepared, copied, published 
   and distributed, in whole or in part, without restriction of any 
   kind, provided that the above copyright notice and this paragraph 
   are included on all such copies and derivative works. However, this 
   document itself may not be modified in any way, such as by removing 
   the copyright notice or references to the Internet Society or other 
   Internet organizations, except as needed for the purpose of 
   developing Internet standards in which case the procedures for 
   copyrights defined in the Internet Standards process must be 
   followed, or as required to translate it into 











































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Appendix:  
 
Changes from draft-ietf-enum-operations-00.txt 
    
   o Discussion of interesting numbering topologies was added 
    
   o Retrieval of NAPTR records are now described in a separate step 
   from the determination of a service registrar. 
    
   o A new example was created to illustrate ENUM using sub-addressing. 
    
Changes from draft-ietf-enum-operations-01.txt 
    
   O Changed the title to more clearly reflect the intent of the 
   document. 
    
   o Collapsed Level 1 and 2 into a single tier.  Aligned the document 
   to use the _tier_ terminology. 
    
   o Added missing text for dynamic updates. 
    
   o Reworked the examples to eliminate all references to the 
   controversial DNAME and CNAME redirection. 
    
   o Generalized descriptions of the administrative model to avoid 
   exclusion of any particular tier-1 approach. 
    
   o Corrected various errors in the examples. 
    
 
 
    



























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