  ENUM creates many new market opportunities and raises several important
policy issues related to the implementation and administration of the ENUM
database and services. Recent World Telecommunications Policy Forum 2001 dealt
with the emergence of ENUM as an important numbering issue of IP telephony.
This paper prepares some important emerging issues of ENUM administration and
policy by taking an empirical research approach from the bottom up.
  We will identify potential key ENUM services, and estimating the size of the
service market opportunities created by the availability of PSTN-IP addressing
and mapping mechanisms, particularly in the context of IP telephony. Also, we
analyze the possible administrative models and relationship scenarios among
different ENUM players such as Registry(ies), Registrars, Telephone Service
Providers, ENUM Application Service Providers, etc. Then, we will assess the
effects of various administrative model architectures of ENUM service by
looking at the market opportunities and motivations of the players. From the
empirical findings, we will draw the implications on transactions among
different kinds of ENUM service providers. Finally, the results of the model
analysis will be used for the discussion of policy related issues around the
ENUM and IP telephony services.
  Keywords: IP Telephony, ENUM, Internet Policy, Numbering and Addressing
System, Service and Market Study, Administration Model, Empirical Market Study.
