1. February 25, 20041 Infrastructure-ENUM Secure, Private, Next Generation Addressing Infrastructure Douglas J. Ranalli Founder, Chief Strategy Officer NetNumber, Inc. dranalli@netnumber.com

2. February 25, 2004 2 About NetNumber™ Founded 1999. Key investors SAIC and Verisign. Developer and provider of next generation addressing solutions for carriers and operators. – Operator-ENUM: Addressing for IP-services. MMS, SMS direct connect, Push-to-talk, VoIP, etc. – Number-Portability: Highly-efficient portability query infrastructure. Legacy circuit switched services as well as IP-services. NetNumber product line: – ENUM Client SDK Licensed to equipment vendors – NetNumber ENUM Server (NES) Master & Edge software Licensed to service providers. Introduction

3. 3 North American Deployment Examples North American Deployment Examples MMS – Portability corrected MMS address resolution across GSM and CDMA networks in North America. ENUM Service = E2U + MMS Deployment status: Multiple NA operators in test or production today. Multiple vendors providing infrastructure-ENUM solutions in NA today. SMS – Portability corrected SPID discovery across GSM and CDMA networks in NA. Deployment status: Multiple NA operators and content providers in production today. Circuit-Switched Voice – Number portability – Low cost, high performance infrastructure for accessing number portability data. Deployment status: Multiple NA mobile and fixed line carriers in test or production today. IMS (SIP) – End-user specific service discovery for next generation SIP services. (Push-to- talk, IM, Presence, etc.) Deployment status: Vendor integration activity only. Introduction

4. February 25, 2004 4 Operator-ENUM Background Multiple years of market feedback. – Fixed-line carriers, mobile operators and equipment vendors. – Germany, UK, US, Italy, Spain, Finland, Japan. – Discussions focused on portability corrected addressing for MMS, IMS (SIP) and VoIP services. Multiple architectures evaluated. – Global centralized Tier-1 registry model. – Distributed country-level Tier-1 registries. – No centralized Tier-1 registry. Clear customer feedback provided as soon as underlying market requirement was identified – First operator-ENUM use case: Portability corrected MMS addressing across GSM and CDMA networks in North America. Introduction

5. February 25, 2004 5 Operator-ENUM Customer Driven Principles Operator Control – Private DNS infrastructure – Operator controls provisioning of Tier-2 service addresses. – Operator controls access to Tier-2 data. No Centralized Registry Infrastructure – Existing regulatory structure defines who controls a given E.164. – Operators already have access to block and ported number data in their own market and via interconnect partners in other markets. No Third Party TLD. – E.164 name is already globally unique. +1-212-555-1234 – No TLD required in the domain name: 4.3.2.1.5.5.5.2.1.2.1. Single Operator Decision – Architecture must allow a single operator to begin using ENUM without waiting for other operators to deploy an ENUM infrastructure. Architecture

6. February 25, 2004 6 Operator-ENUM Architecture NES Implementation Operator-ENUM Architecture NES Implementation Tier-1 ENUM: E164  SPID – Portability-corrected service provider ID (SPID). Locally provisioned number-block assignment data. Locally provisioned ported number data. Referral to another database for portability data outside the local market. – ENUM server located in another portability region – HLR located on the SS7 network (via referral to DNS/MAP gateway) Tier-2 ENUM: SPID  service address – MMS, Push-to-talk, SIP-based voice service, Presence, etc. Locally provisioned service address data for internal users. Locally provisioned service specific default for interconnect partner. – Example: Default MMS address for an interconnect partner. e164@mms.operator.com Referral to an interconnect partner’s ENUM server. Architecture

7. February 25, 2004 7 MMS Address Resolution Single Portability Region (US Market) GSM to CDMA to Fixed-line Application

8. February 25, 2004 8 MMS Query Flow MMS Query Flow End-user dials phone number to send MMS message. MMSC issues a standard ENUM query to a local ENUM server. ENUM server checks Tier-1 data to get portability corrected service provider ID (SPID). – Locally provisioned number-block and ported number data. ENUM server checks Tier-2 data to determine how to resolve an MMS address for the interconnect partner discovered from Tier-1. The NetNumber ENUM Server (NES) supports two resolution options: – Static MMS address: Operator manually provisions a single static MMS address for each interconnect partner. – Cross-Operator ENUM Query: Operator provisions ENUM referral for interconnect partners ENUM server. ENUM server returns standard ENUM response to the MMSC with portability-corrected MMS address. Common solution across CDMA, GSM, Fixed-line Application

9. February 25, 2004 9 IMS (SIP) Address Resolution Multiple Portability Regions (Germany to US) Application

10. February 25, 2004 10 Security Considerations Two interfaces to consider: – Application ENUM query MMSC to ENUM server – Cross-operator query Tier-1 query for SPID or Tier-2 query for NAPTR record. NES Supports Three Authentication Options – None: Source IP over trusted network – TSIG: Transaction signature (RFC 2845) with shared secret key. – Extended TSIG: Transaction signature using public/private keys. Application

11. February 25, 2004 11 ETSI Plugtest Considerations Infrastructure ENUM solutions still in early stages of deployment. – Single country deployments – Single operator decisions – No cross-operator queries – Simple static/default service addressing at Tier-2. Interoperability across infrastructure ENUM deployments won’t be an issue until the market evolves further. – Tier-1 referrals across multiple portability regions (i.e. US to Germany) – Cross-operator Tier-2 queries for end-user specific data. Interoperability issues for future consideration – Format of Tier-1 query for portability corrected SPID across multiple portability regions. – Mandatory cross-operator authentication options. Source IP TSIG with digital signature TSIG with public/private key

12. February 25, 200412 Thank You