ENUM Call Flow Scenarios

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ENUM Call Flow Scenarios Workshop Document: WS ENUM-8-E Original: English ENUM Call Flow Scenarios Steven D. Lind AT&T +1 973 236 6787 sdlind@att.com

Tutorial Workshop on ENUM Geneva, 8 February 2002 ITU Telecommunication Standardization Bureau Document No. 8-E Study Group 2 Tutorial Workshop on ENUM Geneva, 8 February 2002 SOURCE: Steven D. Lind TITLE: ENUM Call Flow Scenarios

Overview Cover 3 “call” scenarios Based on certain assumptions 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 DNS IP-based Network 2. Application client formats number into FQDN (e.g., 7.8.7.6.6.3.2.3.7.9.1.e164.arpa) and looks up name in DNS 3. DNS returns all NAPTR records associated with FQDN 4. Application selects appropriate NAPTR record (e.g., mailto:sdlind@att.com) and completes processing 1. End user enters E.164 Number: 1-973-236-6787 (e.g., in to: field)

Call from CSN to IP-based Networks 3a. G/W formats FQDN 7.8.7.6.6.3.2.3.8.9.1. e164.arpa; looks up FQDN in DNS 3b. DNS returns NAPTR recs, eg: sip:sdl@sip.att.net 6. Call is completed to port of designated user DNS Gateway CSN IP-based Network SIP Client SIP Server 5. Call is routed to designated IP address 4a. G/W looks up host name for sip.att.net in DNS 4b. DNS returns IP address of host (sip.att.net) 2. CSN Provider forwards to appropriate Gateway 1. End User dials E.164 Number: 1-973-236-6787

Call from IP-based to CSN Networks 2a. SIP Client formats number into FQDN and looks up in DNS 2b. DNS returns NAPTR recs, eg: tel:+19732366787 DNS Gateway CSN IP-based Network SIP Client SIP Server 1. End user dials E.164 Number: 1-973-236-6787 LS 4a. SIP Server looks up G/W address in Location Server 3. SIP Client initiates INVITE 5. SIP Server routes call to appropriate G/W 4b. Location Server returns IP address of G/W 6. Gateway completes call through CSN

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