IP and Telecoms Interworking Workshop
Numbering, Naming Addressing and Routing
IETF EMUM WG Proposal
International Telecommunication Union
Telecommuniations Standardization Bureau
Geneva January 2000
Document IPW-4
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Presented By
Representing IETF
Richard Shockey
8045 Big Bend Boulevard, Suite 110
Saint Louis, Missouri 63119 USA
(314) 918.9020 Voice
(314) 918.9015 Fax
E.Mail/IFAX rshockey@ix.netcom.com
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Problem Statement
How do you link the resources of the
GSTN with the resources of the
Internet?
How do you find a resource on the
Internet if you only have a telephone
number [E.164]?
How do you make this simple, easy to
use without “reinventing the wheel”?
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Solution Proposal – ENUM WG
Put Telephone Numbers into the Global
Domain Name System [DNS]
Use proposed NAPTR and SRV
Resource Records [RR] to find :
•
•
•
•
IP Address
E-Mail addresses
SIP / H.323 servers
LDAP directories
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Why DNS?
Its there ..
• It works .. its global .. it scales .. its fast
.. its open.
Why not something else?
• X.500 ?
• It was the judgment of the IESG to explore
the DNS option first.
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What ENUM is NOT…
Actual Routing of Phone calls within the
terminating application protocol ..what
ever that may be.
It is not a “white pages directory
service”
Does not list “capabilities” of endpoints
– IETF RESCAP WG
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“Out of Scope” for ENUM
Provisioning “e164.int”
Propagation
Administration
Service Logic
Carrier Accounting - Reconciliation
Anything to do with “policy”
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How does ENUM Work?
Take a fully qualified E.164 number and
create a DNS entry in a highly defined
and structured domain.
The search for resources associated with
1 314 918-9020 becomes a look up to :
0.2.0.9.8.1.9.4.1.3.1.e164.int
Each digit becomes a definable and
distributed “zone” in DNS terms
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How does ENUM Work?
Response to query for
2.8.0.4.6.2.6.5.8.6.4.e164.int
In this response the prefered contact method is SIP
ord pr fl
service
re replacement
IN NAPTR 10 10 "a" "sip+N2R"
"" "sip:paf@swip.net”.
IN NAPTR 102 10 "s" "potscall+N2R" "" _potscall._tcp.paf.swip.net.
IN NAPTR 102 10 "a" "smtp+N2R"
"" "mailto:paf@swip.net".
In this response the prefered contact method is H.323
IN NAPTR 10 10 "s" "sip+N2R"
"" “h323gw.tele3.se.
IN NAPTR 102 10 "s" "potscall+N2R" "" _potscall._tcp.paf.swip.net.
IN NAPTR 102 10 "a" "smtp+N2R"
"" "mailto:paf@swip.net".
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ENUM in VoIP Gateways
ENUM allows gateways to find each
other.
ENUM is not for routing calls where
than one gateway can handle the call.
• IPTEL WG – [TRIP] Telephony Routing
Information Protocol ( proposed )
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ENUM in Universal Messaging
EMA-IETF Voice Profile for
Internet Mail [VPIM]
ENUM enables carrier and
enterprise Voice Mail systems to
interoperate and exchange
messages
Retrieve voice mail from anywhere
in the world with a local call
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ENUM in Fax
Fax is not “dead.”
• Fax is a essential global communications
service.
• Fax number to E-Mail box [IETF RFC
2305-ITU T.37]
• Fax number to ITU-T.38 servers
• Fax number to Internet Print Protocol
servers
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ENUM in Local Number Portability
ENUM could be used for Local
Number Portability by carriers.
SCP servers could query DNS for
available records.
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Conclusions
“Standards are wonderful…that’s
why we have so many of them.”
Dr. Herman R. Silbiger ITU SG8/Q4 Rapporteur
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The Real OSI Model
9. Political < You are here
8. Financial
7. Application
6. Presentation
5. Session
4. Transport
3. Network
Apologies to University of Colorado
2. Link
Engineering Scholarship fund
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1. Physical