STUDY PERIOD 2001 - 2004

COM 2-LS 42/2-E
Date: May 2002
Original: English




itu-t sg2, 7-16 may 2002









agreed sg2 16 may 2002







Philippe Distler

Chairman, WP 1/2

Tel: +33 1 40 47 71 20

Fax: +33 1 40 47 71 90




The ITU-T Study Group 2 plenary has approved interim procedures for delegation of E.164 geographic country codes into the domain in accordance with RFC 2916. These procedures provide instructions to the ITU-T Telecommunications Standardization Bureau (TSB) with respect to its interactions with the technical manager of (currently the RIPE-NCC), in order to specify what TSB should do whenever it receives a request for the delegation of an E.164 country code. The interim procedures are attached.

The domain name is the root under which the whole ENUM system will be implemented for the period of validity of the interim procedures (i.e. until definitive procedures set out in an ITU-T Recommendation supersede the interim procedures).

The ITU-TSB has a major role to play for the sound implementation of these interim procedures and to ensure that the data entered into the domain and its sub-domains are consistent with the E.164 numbering plan.

In that context, Study Group 2 seek assurances that the Director of ITU-T TSB and the appropriate Study Group would be consulted before significant changes that would affect the interim procedures take place.

For example:

˙                    references to TSB's role in the IAB Instructions to RIPE NCC and,

˙                    the choice of the Tier 0 Registry, at present RIPE NCC.

There might be several ways to address these assurances with a view to formalizing the understandings reached and associated relationships.  As an example, one way could be a Memorandum of Understanding or similar document between ISOC and ITU-T covering the issues.

We would welcome suggestions from IAB concerning the best ways to address these issues.

ENUM administration ad interim

(Revised 14 May 2002 - clean version of the text)


1           Background

It appears that there is considerable interest in starting ENUM trials in some Member States so that it would be appropriate to provide interim procedures to enable such trials to take place. 

In response to this interest, the Internet Architecture Board (IAB) issued instructions to RIPE-NCC regarding how to proceed with any requests received by RIPE-NCC.  The instructions are reproduced for information in the Appendix of this contribution.  It should be noted that the instructions are fully consistent with the statement:

Member States will have the right to choose whether to participate in the common designated ENUM domain, or not to participate in it, at their discretion.

Consistency with the above statement is achieved by RIPE-NCC’s referring any requests for delegations[1] of domain names corresponding to E.164 country codes[2] to the Telecommunications Standardization Bureau (TSB) for approval.

It is important that the TSB process any such requests in a transparent and consistent way, and therefore these procedures have been created.  In the long-term, it is envisaged that the TSB processes and procedures will be specified in a future Recommendation(s).

2           Scope

The purpose of this document is to set out the interim procedures that will be used by the TSB, should the TSB receive a request from RIPE-NCC before final approval of the future Recommendation(s).  The procedures to be described in the finally approved version of the future Recommendation(s) will supersede these interim procedures.  These procedures shall not prejudice the future Recommendation(s).

The following agreements were made relative to the interim procedures:

˙                       The interim procedures will remain in effect until the approval of a future Draft Recommendation(s), currently Draft Recommendation E.A-ENUM, which will then supersede these interim procedures. 

˙                       The interim procedures can be modified at any time and will be reviewed no later than the scheduled May meeting of SG2 in 2003. 

These interim procedures cover only assigned geographic country codes.  Unless further guidance is received to the contrary from Study Group 2, the TSB will send an objection to RIPE NCC with respect to any requests for delegations of any other types of country codes.

3           Interim Procedures

These interim procedures are consistent with the agreed SG2 statement that Member States will have the right to choose whether to participate in the common designated ENUM domain, or not to participate in it, at their discretion, and with the procedures currently under development as specified in the future Recommendation(s).

3.1        Formal Validity of CC

When the TSB receives a request from RIPE NCC, it will first verify that the country code (CC) mentioned in the request meets the formal conditions for delegation for ENUM, namely:

1.                     That the code is a currently-assigned country code, and

2.                     For country codes within an integrated numbering plan, the request corresponds to that portion of the code for which the requesting Member State has administrative responsibilities.  When a request representing the entire integrated country code area is received, all Member States within the integrated numbering plan must endorse the request.

If these conditions are not met, the TSB will notify RIPE NCC that it objects to the delegation.  As a consequence, the delegation will not take place.

3.2        National Position Known

If the conditions of 3.1 are met, and if the concerned Member State has notified the TSB of its position regarding delegation for ENUM of its CC, then the TSB will immediately make that position known to RIPE NCC.

That is, TSB will inform RIPE NCC that the concerned Member State either approves or objects to the delegation.  If the Administration objects, the delegation will not take place.

Since the request from RIPE NCC will designate a specific ENUM Tier 1 Registry, the TSB will only be able to approve the request if the Member State has notified the TSB that it approves that particular Tier 1 entity.

3.3        National Position Not Known

If the conditions of 3.1 are met, but the concerned Member State has not previously notified the TSB of its position regarding delegation for ENUM of its CC, then the TSB will proceed as follows:

1.                     Within 60 days, notify RIPE NCC that it objects to the delegation, because it has not received approval from the concerned Member State.

2.                     Within 60 days, notify the concerned Member State of the request and of the TSB objection sent to RIPE NCC, and request the Member State to advise the TSB if the objection should be rescinded and an approval sent to RIPE NCC.

3.                     If an approval is received from the Member State, notify RIPE NCC of that approval.

That is, the delegation will not take place until the concerned Member State has notified the TSB that it approves the delegation.

3.4        Change in National Position

If a Member State notifies the TSB of a change in its position, the TSB will communicate that change to RIPE NCC, who will implement the change.  The changes can be:

1.                     A previously granted approval becomes an objection.  In this case, the delegation will be removed and ENUM will no longer be available for the concerned CC.

2.                     A previously stated opposition, or lack of approval, becomes an approval.  In this case, the delegation will be granted and ENUM will be available for the concerned CC.

3.                     There is a change in the party to which the CC is delegated, that is, a change in the ENUM Tier 1 Registry.  In this case, the TSB will notify RIPE NCC of that change and the change will be implemented.

That is, a Member State may at any time stop, enable, or change ENUM delegations.

3.5        Communication Methods

1.                     Communications between the TSB and Member States will be between the Director of the TSB and the official contact nominated by the Administration of the concerned Member State and on file with the ITU.  Administrations of Member States are encouraged to notify the TSB regarding who should be the official contact for ENUM matters.  Such notification shall be provided by the official contact described below.

In the absence of a specific notification for ENUM matters, the official Administration point of contact listed in the ITU Directory will be used.[3] Communications will take place by physical letter or facsimile, although E-Mail may be used in addition for clarification (but not for formal decisions).

2.                     To expedite the process, initial requests should be sent first to the TSB.  After approval is received, the requests can be sent to RIPE NCC in conformance with the RIPE NCC Instructions.

3.                     All approvals will be posted on the TSB Web site at

4.                     Communications between the TSB and RIPE NCC will take place by E-Mail.  The TSB will designate a mail address for this purpose.  The TSB will keep an archive of all E-Mails sent and received.

Any approvals sent to RIPE NCC will be confirmed in writing by the Director of the TSB.

5.                     When notifying an approval to RIPE NCC, the formal approval letter by the Director of the TSB will contain appropriate language with respect to the Member State’s authority to revoke its approval and transform it into an objection.




[1] The term “delegation” as it applies to the Domain Name System (DNS) is described in RFC 1591.

[2] See RFC 2916.

[3] For information, these official contacts can be found at by clicking on the Member State entry and then, within the Member State entry, on the entry listed as “ADMIN”.