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NGN Issues - Numbering and Addressing Peter Darling ACIF NGN FOG No. 3

NGN Issues - Numbering and Addressing Peter Darling ACIF NGN FOG No. 3. Numbering in Carrier Networks. Carrier networks use E.164 numbers Allocated at the national level With the addition of a country code, provides a unique global number +61 3 5422 7503

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NGN Issues - Numbering and Addressing Peter Darling ACIF NGN FOG No. 3

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  1. NGN Issues - Numbering and AddressingPeter DarlingACIF NGN FOG No. 3

  2. Numbering in Carrier Networks • Carrier networks use E.164 numbers • Allocated at the national level • With the addition of a country code, provides a unique global number +61 3 5422 7503 • E.164 numbers serve as both network addresses and end user “names”

  3. Internet Principles - Addressing • A unique IP address is allocated for each end-point • Because of limited address space in IPv4, IP addresses are often allocated on a dynamic basis from an available pool allocated to the service provider • The greater address space available in IPv6 is designed to overcome this problem • IP addresses are allocated globally, not at the national level • IP addresses generally only have network significance

  4. Internet Principles - Naming • The Domain Name system is designed to provide a means for end-user access to required resources • The system of Domain Name Servers translate the URL entered by a user into an IP address to be incorporated into each packet header • The correct operation of the DNS is essential for the operation of the Internet

  5. Internet Operation • The initiating user provides the details of the desired destination e.g. www.acif.org.au • A request for information goes to the root server for the Domain (.au in this case) and any subsequent domain name servers. • The DNS returns the IP address of the desired destination (acif.org.au)192.148.121.105 • The user’s equipment prepares to send the first packet

  6. NGN Issues • Carrier services on the NGN are likely to have an E.164 number (e.g. telephony) • This number will be used by callers and when interworking with current networks • End-points on the NGN and Internet will have IP addresses (and other addresses such as SIP addresses) • These addresses will be be needed for NGN connectivity • There is a need to translate between the two addressing schemes

  7. ENUM • The IETF has developed the ENUM specification to enable an E.164 number to be used to access the DNS system • ENUM can be used to facilitate interworking between telephony (and other carrier services) and IP services (including IP telephony and multimedia) • As a database, ENUM could also store other information about the owner of the E.164 number, such as the services (and their addresses) registered by the owner • The IETF and ITU-T Study Group 2 are looking at the implementation of ENUM

  8. ENUM supporting Interworking From Internet Draft draft-ietf-enum-usage-scenarios-00

  9. Call from PSTN to IP-Based Network POTS Phone PSTN Gateway • Caller dials an E.164 number, using either local, national or international format IP Based Network SIP Client SIP Server POTS Phone Voice Path Signalling Path From Internet Draft draft-ietf-enum-usage-scenarios-00

  10. Call from PSTN to IP-Based Network POTS Phone PSTN Gateway • The PSTN routes the call to the IP network gateway. This could be selected by either the number allocation to the IP service provider or a separate IP number range • but what about number portability? IP Based Network SIP Client SIP Server POTS Phone Voice Path Signalling Path From Internet Draft draft-ietf-enum-usage-scenarios-00

  11. Call from PSTN to IP-Based Network POTS Phone PSTN Gateway • The gateway translates the E.164 address (after conversion to full international number) to an ENUM format • The gateway interrogates the DNS, which returns any service records associated with the E.164 number/URL IP Based Network SIP Client SIP Server DNS Voice Path Signalling Path From Internet Draft draft-ietf-enum-usage-scenarios-00

  12. Call from PSTN to IP-Based Network POTS Phone PSTN Gateway • In this example, the record indicates that the wanted destination uses a SIP server • The gateway interrogates the DNS for the IP address of the required SIP server IP Based Network SIP Client SIP Server DNS Voice Path Signalling Path From Internet Draft draft-ietf-enum-usage-scenarios-00

  13. Call from PSTN to IP-Based Network POTS Phone PSTN Gateway • The call is routed via the IP-based network to the SIP server IP Based Network SIP Client SIP Server DNS Voice Path Signalling Path From Internet Draft draft-ietf-enum-usage-scenarios-00

  14. Call from PSTN to IP-Based Network POTS Phone PSTN Gateway • The SIP Server routes the call to the SIP Client for the called user • When the destination party answers/clears, this information is signalled back to the PSTN IP Based Network SIP Client SIP Server DNS Voice Path Signalling Path From Internet Draft draft-ietf-enum-usage-scenarios-00

  15. Other Information that may be Stored • A range of “enumservice” can be defined, to store information associated with the owner of the E.164 number. These could include • IP and SIP addresses for service delivery • SMTP (email) addresses • WWW URL • Fax (IP or PSTN) • Redirection addresses (temporary or permanent, on IP or PSTN • Personal information (name, address, account details

  16. Current ACA Discussion paper • The ACA issued a Discussion Paper “Introduction of ENUM in Australia” in September 2002 • This paper concentrated on the Regulatory and Consumer issues from a database such as ENUM provides • “consideration of existing regulatory provisions which provide consumer protection, choice and protect the long-term interests of end-users” • The paper addresses the important issues of security and authenticity

  17. ENUM Issues • What is the requirement for routing calls to destinations defined by E.164 numbers in IP-based network? • Is the ENUM approach essential, and if so how can the two different roles (routing aid and personal data-base be separated) • Is it desirable (the same questions apply)> • If not required, what alternate approach can be used? [The current difference between numbering for routing and operational purposes (CLI and IPND database) and optional number display may provide a precedent]

  18. General Issues • At some future time there could be two main groups of networks in operation, one circuit-switched, the other packet-switched. In such a case, there are advantages in a network architecture that crosses to the terminating section as soon as possible (minimising encoding/conversion, for example. • Should/could there be separate number ranges for IP based multimedia services to assist routing (and provide user information? • Could numbers be used to indicate service/QoS requested/provided? • If telephony service is provided on both groups of networks, how can number portability be supported whilst allowing network separation • Should all calls be routed by an ENUM style database to support portability and optimum routing?

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