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IMPORT
R:\\ART\\W INTERNATIONAL TELECOMMUNICATION UNION
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CCITT D.11
THE INTERNATIONAL
TELEGRAPH AND TELEPHONE
CONSULTATIVE COMMITTEE
GENERAL TARIFF PRINCIPLES
CHARGING AND ACCOUNTING IN
INTERNATIONAL TELECOMMUNICATIONS
SERVICES
SPECIAL TARIFF PRINCIPLES FOR
INTERNATIONAL PACKET-SWITCHED PUBLIC
DATA COMMUNICATION SERVICES BY
MEANS OF THE VIRTUAL CALL
FACILITY
Recommendation D.11
IMPORT Geneva, 1991
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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.11 was prepared by Study Group III and was approved under
the Resolution No. 2 procedure on the 22 of March 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.
F 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.
PAGE BLANCHE
Recommendation D.11
Recommendation D.11
SPECIAL TARIFF PRINCIPLES FOR INTERNATIONAL PACKET-SWITCHED
PUBLIC DATA COMMUNICATION SERVICES BY MEANS
OF THE VIRTUAL CALL FACILITY
(Geneva, 1980, revised 1990)
Preamble
This Recommendation, which should be applied in conjunction with the
provisions of Recommen-dation D.10, sets out the special tariff principles
intended for application to the international packet-switched public data
communication service by means of the virtual call facility.
Since this is a rapidly developing field at the present time in terms of
the diversity of application, flexibility is essential.
1 Definition
virtual call (switched connection)
One service of the packet switched data transmission services in which a
call set-up procedure and a call clearing procedure will determine a period of
communication between two DTEs, during which users' data will be transferred in
the network in the packet mode of operation. All the usersÆ data are delivered
from the network in the same order in which they are received by the network.
2 Principles for the application of charges
2.1 Chargeable calls
The following virtual calls are chargeable:
i) a call request for which the outgoing data switching exchange (DSE)
sends to the calling DTE the call-connected packet after it receives
the call-accepted packet from the called DTE (see the diagram in Figure
1/D.11);
ii) a call request which is cut off before the call-connected packet from
the remote DSE is received by the local DSE, owing to one of the
following reasons:
a) one of the DTEs sends a clear request packet;
b) remote procedure error of the DTE;
c) local procedure error of the DTE.
2.2 Administrations reserve the right to apply a charge to all call attempts.
This charge should not apply if an unsuccessful call attempt is due to congestion
or a fault in the AdministrationÆs equipment.
3 Tariff components
3.1 The tariff for the service should consist of the following components:
ù the network access component,
ù the network utilization component.
styleref head_footRecommendation D.11PAGE
3
3.2 Network access component
3.2.1 Access charges should be levied for each subscription and should normally
be independent of network utilization. They may consist of:
a) an initial fee (non-recurring);
b) a subscription rental (payable at certain intervals, e.g. monthly, or
quarterly, until the subscription is terminated).
3.2.2 Different access charges may apply for access from other public-switched
networks, e.g. from the public telephone network to the packet-switched data
network.
3.2.3 The access charges shall not be included in international accounts between
Administrations and their establishment is strictly a national matter.
3.3 Network utilization component
3.3.1 The charges relating to the network utilization component should be
proportional to the volume of information transmitted and to the duration of
communication and should be calculated in accordance with the methods prescribed
in S 3.3.2 and 3.3.3 below.
3.3.2 The volume of information transmitted should be measured and expressed in
conformity with Recommendation D.12.
3.3.2.1 Any chargeable packet other than the data packet should be considered
as a packet for which a charge corresponding to a segment is levied.
3.3.2.2 The following packets are chargeable1) :
ù data packet;
ù interrupt packet;
ù call request/call incoming packet;
ù reset request/reset indication packet, provided the cause of call reset
is either DTE originated, local procedure error or remote procedure
error;
ù clear request (when the fast select facility is signalled in the call
request packet without restrictions).
3.3.3 The chargeable duration of a communication should be calculated on the
basis of the information below.
3.3.3.1 The duration of communication (see the diagram in Figure 1/D.11) should
be measured and expressed in terms of a unit being equal to one minute.
3.3.3.2 The duration of the communication should be the interval between:
ù the moment when the call-connected packet or the call-accepted packet
is sent or received by the charging DSE2) where the recording of the
duration takes place; and
ù the moment when the clear request packet or the clear indication packet
is received or sent by the charging DSE.
3.3.3.3 If the duration of communication thus obtained contains a fraction of a
minute, it should be rounded up to the next whole minute.
3.3.3.4 For a chargeable call as provided in S 2.1 ii) above, Administrations
may apply a duration charge equal to one unit in addition to the charge in
accordance with S 3.3.2.1.
4 International accounts
Accounting rates should be determined on the basis of either:
i) volume of information transmitted, or
ii) volume of information transmitted and duration of communication.
Figure 1/D.11 = 22,5
1) Further study to complete the list of chargeable calls and chargeable packets for
international services may be required.
2) The charging Administration should, in principle, obtain the information required
for charging purposes. Therefore, in the case
of a call using the reverse charging facility, it is the called Administration which is
responsible for obtaining charging
information.
PAGE2 styleref head_footRecommendation D.11