1. ENUM Ad Hoc Meeting Douglas Ranalli Founder, Chief Strategy Officer dranalli@netnumber.com February 12, 2001

2. History June 1997: Unifi directory services program. 1998 – 1999: Early work with voice messaging – EMA and VMA joint initiative. – Lucent, Nortel, Comverse, Siemens, Unisys, etc. October 1999: NetNumber stand-alone – Raised $9.5 million VC funding. May 2000: First production release November 2000: ENUM compliant

3. Current View Pro competition – not against e164.arpa. Clear value in ENUM as a technical standard. Not convinced that an exclusive e164.arpa implementation is a winner for the industry. NetNumbers focus is on the adoption of ENUM in the market. – ENUM service provider.

4. ENUM Challenges Tier-1 Challenge: – e164.arpa is a distributed solution – Administration by every ITU Member State – No guarantee of efficient deployment Tier-2 Challenge: – Tier-1 points to a single Tier-2 – No guarantee that an exclusive Tier-2 provider will provide access to NAPTR records.

5. e164.arpa Market Risks Time to market – How long will e164.arpa take to evolve? Participation consistency – Will e164.arpa yield a global solution? Policy consistency – Who gets to run Tier-2 under e164.arpa? – Will every country agree on a competitive structure? Pricing consistency – Will pricing promote the growth of ENUM? – Will many small providers be efficient?

6. Competitive Alternative Embrace three types of ENUM services – Private ENUM e164.company.com – Commercial ENUM e164.com – Public ENUM e164.arpa ENUM Resolver isolates application. – Customer defines set of domains to query – Resolver returns full set of addresses. Common Requirement – Validation of subscriber intent

7. Will Competition Help? Time to market – How long will e164.arpa take to evolve? Participation consistency – Will e164.arpa yield a global solution? Policy consistency – Will every country agree on a competitive structure? Pricing consistency – Will pricing promote the growth of ENUM?

8. Conclusion Embrace competitive environment Participate in e164.arpa if consistent with US policy. Explore regulatory environment in US around ENUM validation.