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Workshop Document: WS ENUM-8-E Original: English . ENUM Call Flow Scenarios. Steven D. Lind AT&T +1 973 236 6787 sdlind@att.com. ITU Telecommunication Standardization Bureau Document No. 8-E Study Group 2. Tutorial Workshop on ENUM Geneva, 8 February 2002 SOURCE:Steven D. Lind

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ENUM Call Flow Scenarios

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Enum call flow scenarios l.jpg

Workshop Document: WS ENUM-8-E

Original: English

ENUM Call Flow Scenarios

Steven D. LindAT&T+1 973 236 6787sdlind@att.com


Itu telecommunication standardization bureau document no 8 e study group 2 l.jpg

ITU Telecommunication Standardization BureauDocument No. 8-EStudy Group 2

Tutorial Workshop on ENUM

Geneva, 8 February 2002

SOURCE:Steven D. Lind

TITLE:ENUM Call Flow Scenarios


Overview l.jpg

Overview

  • Cover 3 “call” scenarios

    • IP-based to IP-based

    • CSN to IP-based

    • IP-based to CSN

    • IP-based origination of global services is a special case

  • Based on certain assumptions

  • Applications are only examples; others possible


Communication between ip based terminals l.jpg

DNS

3. DNS returns allNAPTR recordsassociated with

FQDN

IP-basedNetwork

2. Application client formatsnumber into FQDN (e.g.,7.8.7.6.6.3.2.3.7.9.1.e164.arpa)and looks up name in DNS

4. Application selects appropriateNAPTR record (e.g., mailto:sdlind@att.com)and completes processing

Communication between IP-based terminals

1. End user enters E.164Number: 1-973-236-6787 (e.g., in to: field)


Call from csn to ip based networks l.jpg

3b. DNS returns NAPTR recs, eg: sip:sdl@sip.att.net

6. Call is completed to port of designated user

DNS

5. Call is routed to designated IP address

4b. DNS returns IP address of host (sip.att.net)

SIP Client

SIP Server

IP-basedNetwork

3a. G/W formats FQDN7.8.7.6.6.3.2.3.8.9.1.e164.arpa; looks upFQDN in DNS

2. CSN Providerforwards to appropriate

Gateway

CSN

4a. G/W looks up host name for sip.att.net in DNS

Gateway

1. End User dials E.164Number: 1-973-236-6787

Call from CSN to IP-based Networks


Call from ip based to csn networks l.jpg

2b. DNS returns NAPTR recs, eg: tel:+19732366787

DNS

LS

SIP Client

SIP Server

2a. SIP Client formats number into FQDN and looks up in DNS

IP-basedNetwork

4a. SIP Server looks up G/W address inLocation Server

3. SIP Client initiates INVITE

5. SIP Server routescall to appropriate G/W

CSN

Gateway

6. Gateway completes call through CSN

Call from IP-based to CSN Networks

1. End user dials E.164Number: 1-973-236-6787

4b. Location Serverreturns IP addressof G/W


Summary l.jpg

Summary

  • ENUM can be used on application specific basis

    • Each application looks for a specific NAPTR record (or discreet set of records) that it can process

  • Potential for communication control application

    • Takes in all NAPTR records and uses application and priority information to make communication between two parties efficient

    • Subscriber can exert some control within the parameters of the defined NAPTR record


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