INTERNATIONAL  TELECOMMUNICATION  UNION	

CCITT	D.250
THE  INTERNATIONAL
TELEGRAPH  AND  TELEPHONE
CONSULTATIVE  COMMITTEE

GENERAL  TARIFF  PRINCIPLES
CHARGING  AND  ACCOUNTING  IN
INTERNATIONAL  TELECOMMUNICATIONS
SERVICES

GENERAL  CHARGING  AND  ACCOUNTING
PRINCIPLES  FOR  NON-VOICE  SERVICES
PROVIDED  BY  INTERWORKING  BETWEEN
THE  ISDN  AND  EXISTING  PUBLIC  DATA NETWORKS

Recommendation  D.250

	Geneva, 1991	

Printed in Switzerland

FOREWORD
	The CCITT (the International Telegraph and Telephone Consultative Committee) is a permanent organ of the International Telecommunication Union (ITU). CCITT is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis.
	The Plenary Assembly of CCITT which meets every four years, establishes the topics for study and approves Recommendations prepared by its Study Groups. The approval of Recommendations by the members of CCITT between Plenary Assemblies is covered by the procedure laid down in CCITT Resolution No. 2 (Melbourne, 1988).
	Recommendation D.250 was prepared by Study Group III and was approved under the Resolution No. 2 procedure on the 15 of July 1991.

___________________

CCITT  NOTE
	In this Recommendation, the expression “Administration” is used for conciseness to indicate both a telecommunication Administration and a recognized private operating agency.

ã  ITU  1991
All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the ITU.

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Recommendation D.250
Recommendation D.250
GENERAL  CHARGING  AND  ACCOUNTING  PRINCIPLES  FOR  NON- VOICE  SERVICES
PROVIDED  BY  INTERWORKING  BETWEEN  THE  ISDN
AND  EXISTING  PUBLIC  DATA  NETWORKS
(Melbourne, 1988)
	The CCITT,
considering
	(a)	that, during the transition period, it is essential that Administrations provide interworking between existing public data networks and the ISDN in order to continue providing users with non-voice services;
	(b)	that, it is desirable to adopt general charging and accounting principles for these services when their provision needs interworking between ISDN and existing public data networks;
	(c)	that, in principle, the interworking between these networks should take place in the ISDN country or in the country of origin (if ISDN is available in both terminal countries);
	(d)	that, in principle, the cost of interworking between the ISDN and existing networks is one element in the development of the ISDN;
	(e)	that customers may elect to subscribe to direct access to interworking arrangements to achieve functional benefits;
	(f)	the relevant D-Series Recommendations,
recommends
1	General principles
	The interworking costs inherent in the ISDN should not be passed on in the form of higher collection charges to the customers of the existing networks.
2	Interworking in the country of origin
2.1	Charging principles
2.1.1	The charges applied should be appropriate to the service requested without regard to the interworking provided.
2.1.2	Additional charges may be applied for access to interworking, when such access is provided at the customer's request. The form of these charges is for further study.
2.2	Accounting principles
	The level and division of the accounting rate should be based on those normally applied for the international network used.

3	Interworking in the country of destination
3.1	Charging principles
3.1.1	The charges applied should be appropriate to the service requested without regard to the interworking provided.
3.1.2	If the destination Administration seeks compensation for the interworking functions, it is recommended that it does so under the provisions of its own national tariffs.
3.2	Accounting principles
3.2.1	In principle, the level and division of the accounting rate should be based on those normally applied to the international network used and there should be no additional accounting for the interworking functions.
3.2.2	If by bilateral agreement additional accounting is agreed, an accounting surcharge may be appropriate.
4	Interworking in a transit country
4.1	Charging principles
	The charges applied should be appropriate to the service requested without regard to the interworking provided.
4.2	Accounting principles
4.2.1	As accounting for transit interworking is very complex, this method of interworking is not recommended.
4.2.2	Interworking provided in a transit country implies dissimilar networks in the two terminal countries. These networks may have radically different accounting rates and the determination of the appropriate accounting arrangement (including the remuneration for the transit Administration) is for further study.