�1����
Scope�������� 1
�2����
References
�3����
Definitions
������� 3.1���� General terms
������� 3.2���� E.164-specific terms
������� 3.3���� ITU-T non-numbering terms
������� 3.4���� DNS-specific terms
������� 3.5���� ENUM-related terms
�4����
Abbreviations
�5����
Background
������� 5.1���� What is ENUM
������� 5.2���� DNS zones and delegation
������� 5.3���� Tiered architecture
������� 5.4���� Overview of ENUM functions and entities
�6����
General administrative issues and options
������� 6.1���� Identification of ENUM Tier 1 Registry or Registries
������� 6.2���� Delegation of names from the ENUM Tier 1 Registry
������� 6.3���� Determination of ENUM Tier 2 Name Server Provider and ENUM Registrars
������� 6.4���� Validation of ENUM requests and records
������� 6.5���� Relationships of administrative structures with ENUM zone
structures
������� 6.6���� Additional considerations
�7����
Implications of ENUM for country codes assigned to geographic areas
������� 7.1���� Administration aspects, options and interfaces
������� 7.2���� Review of consequences
�����������������
7.2.1���� Ease of validation of
relation between E.164 number and telephony subscriber
�����������������
7.2.2���� Analysis of complexity
and effort associated with provisioning
�8����
Summary and conclusion
�9����
Supplement history
Appendix I � Typical
PSTN-IP call flows using SIP
Appendix II �
Integrated numbering plans