INTERNATIONAL  TELECOMMUNICATION  UNION	

CCITT	D.232
THE  INTERNATIONAL
TELEGRAPH  AND  TELEPHONE
CONSULTATIVE  COMMITTEE

GENERAL  TARIFF  PRINCIPLES

CHARGING  AND  ACCOUNTING  IN  INTERNATIONAL  TELECOMMUNICATIONS  SERVICES

SPECIFIC  TARIFF  AND  ACCOUNTING  PRINCIPLES  APPLICABLE  TO  ISDN  SUPPLEMENTARY  SERVICES

Recommendation  D.232

	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.232 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.

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.

PAGE BLANCHE

Recommendation D.232
Recommendation D.232
SPECIFIC  TARIFF  AND  ACCOUNTING  PRINCIPLES  APPLICABLE
TO  ISDN  SUPPLEMENTARY  SERVICES
1	Introduction
	General charging and accounting principles for ISDN supplementary services may be found in Recommendation D.230. This Recommendation indicates the application of the general principles to each ISDN supplementary service. The supplementary services are placed in logical groupings where they share similar considerations and charging principles. Annex A summarizes the charging mechanisms and support requirements.
2	Charging aspects
2.1	Number identification
	This section provides charging principles for the supplementary services, Calling Line Identification Presentation (CLIP), Calling Line Identification Restriction (CLIR), Connected Line Identification Presentation (COLP) and Connected Line Identification Restriction (COLR). Detailed descriptions of the services are provided in Recommendation I.251, § 3 (CLIP), § 4 (CLIR), § 5 (COLP) and § 6 (COLR).
	Considering that:
a)	the calling line number and connected line number are present in the signalling messages associated with call control;
b)	the supplementary services identified above merely allow or prevent the displaying of the embedded information;
c) 	the mechanisms are, therefore, invoked at either the calling or called user's location and do not require additional network resources for invocation,
it is recommended that the charging principles in § 2.1.1 be applied.
2.1.1	Charging principles
	Invocation of the display or restriction service may be charged for by:
a)	inclusion in the rental charges raised against customers; or
b)	the setting of a separate subscription charge; or
c)	a per event charge, or
d)	combinations of a) to c).
2.2	Direct dialling-in and multiple subscriber number
	This section provides charging principles for the supplementary services, Direct Dialling-In (DDI) and Multiple Subscriber Number (MSN). Detailed descriptions of the services are provided in Recommendation I.251, § 1 (DDI) and § 2 (MSN).

	Considering that:
a)	the call establishment procedures are fundamentally unaltered;
b)	the supplementary services identified above merely allow the direct establishment of calls to users connected to integrated services PBXs or passive busses;
c)	the mechanisms are invoked only at the called user's location and do not require additional originating or international network resources for invocation,
it is recommended that the charging principles in § 2.2.1 be applied.
2.2.1	Charging principles
	Invocation of the services may be charged for by either:
a)	inclusion in the rental charges raised against customers; or
b)	the setting of a separate subscription charge.
	Those charges would normally be proportional to the quantity of the numbers assigned.
2.3	Call forward and call transfer
	This section provides charging principles for the supplementary services, Call Transfer (CT), Call Forwarding Busy (CFB), Call Forwarding No Reply (CFNR) and Call Forwarding Unconditional (CFU). Detailed descriptions of the services are provided in Recommendation I.252, § 1 (CT), § 2 (CFB), § 3 (CFNR) and § 4 (CFU).
	Considering that:
a)	Call Transfer and Call Forwarding are functionally equivalent;
b)	the supplementary services identified above allow the diversion of active (Call Transfer), or incoming (Call Forward) calls to a third party;
c)	the mechanisms are invoked only at the served user's location and do not require additional originating or international network resources for invocation,
it is recommended that the charging principles in § 2.3.1 be applied.
2.3.1	Charging principles
	Invocation of the services may be charged for by either:
a)	inclusion in the rental charges raised against customers; or
b)	the setting of a separate subscription charge; and
c)	a usage charge based upon the number of successful invocations.
	The served user is also responsible for the basic charges raised against the transferred (re-used connection method only) or forwarded call.

2.4	Line Hunting
	This section provides charging principles for the Line Hunting supplementary service. Detailed description of the service is provided in Recommendation I.252, § 6.
	Considering that:
a)	the call establishment procedures are fundamentally unaltered;
b)	the supplementary service identified above merely allows the sequential or uniform establishment of calls to users connected to a group of ISDN interfaces;
c)	the mechanisms are invoked only at the called user's location and do not require additional originating or international network resources for invocation,
it is recommended that the charging principles in § 2.4.1 be applied.
2.4.1	Charging principles
	Invocation of the service may be charged for by either:
a)	inclusion in the rental charges raised against customers; or
b)	the setting of a separate subscription charge.
	Those charges would normally be proportional to the quantity of the interfaces in the group.
2.5	Call Waiting and Call Hold
	This section provides charging principles for the supplementary services, Call Waiting (CW) and Call Hold (HOLD). Detailed descriptions of the services are provided in Recommendation I.253, § 1 (CW) and § 2 (HOLD).
	Considering that:
a)	the call establishment procedures are fundamentally unaltered;
b)	the supplementary services identified above merely allow the notification of incoming calls (CW) or the interruption of an existing communication (HOLD);
c)	the mechanisms are invoked only at the served user's location and do not require additional originating, terminating or international network resources for invocation,
it is recommended that the charging principles in § 2.5.1 be applied.
2.5.1	Charging principles
	Invocation of the services may be charged for by either:
a)	inclusion in the rental charges raised against customers; or
b)	the setting of a separate subscription charge.
	Charging for the associated bearer service shall continue during the period that that bearer service is placed on hold.
2.6	Conference calls
	This section provides charging principles for the supplementary services, Conference Call (CONF) and Three Party Service (3PTY). Detailed descriptions of the services are provided in Recommendation I.254, § 1 (CONF) and § 2 (3PTY).
	Considering that
a)	the basic call components (bearers and teleservices) are dealt with under their respective Recommendations;

b)	the supplementary services identified above employ the use of bridging equipment to allow communication between the served user and multiple parties, however the served user in Three-Party service is not allowed to combine multi-party calls into a three-way conversation;
c)	the mechanisms are invoked only at the served user's location and do not require additional originating or international network resources for invocation;
	d)	principles associated with "cascading bridges" are for further study,
it is recommended that the charging principles in § 2.6.1 be applied.
2.6.1	Charging principles
	The services may be charged for:
a)	on the demand basis of bridge usage, i.e. holding time per port; or
b)	by a bundled invocation charge (Three-Party service only).
2.7	Closed User Group
	This section provides charging principles for the Closed User Group supplementary service. A detailed description of the service is provided in Recommendation I.255, § 1.
	Considering that
a)	the call establishment procedures are fundamentally unaltered;
b)	the supplementary service identified above merely allows the access or restriction to a specified list of numbers or optionally to the public network;
c)	the mechanisms are invoked only at the served user's location and do not require additional originating, terminating or international network resources for invocation beyond the checking of the appropriate level of access,
it is recommended that the charging principles in § 2.7.1 be applied.
2.7.1	Charging principles
	Invocation of the services may be charged for by either:
a)	inclusion in the rental charges raised against customers; or
b)	the setting of a separate subscription charge.
	Those charges may be proportional to the access or restriction options subscribed to.
2.8	Advice of Charge
	This section provides charging principles for the Advice of Charge (AOC) supplementary service. A detailed description of the service is provided in Recommendation I.256, § 2.

	Considering that:
a) 	the basic call establishment procedures are fundamentally unaltered;
b)	the supplementary service identified above merely allows the customer to be notified of the price of the current call;
c)	the mechanisms are invoked only at the served user's location and do not require additional originating, terminating or international network resources for invocation,
and recognizing that not all services and charging processes can accommodate this service, it is recommended that the charging principles in § 2.8.1 be applied.
2.8.1	Charging principles
	Invocation of the services may be charged for by either:
a)	inclusion in the rental charges raised against customers; or
b)	the setting of a separate subscription charge; and/or
c)	a per successful invocation charge which may vary according to the stage in the call at which the invocation occurs.
3	Accounting
3.1	Since no additional originating or international network resources are required to provide the supplementary services in this Recommendation, no additional accounting should be required.
3.2	Should the services be provided in an interworking environment, additional resources may be required and accounting arrangements may be necessary (for further study).
4	Charging mechanisms and support requirements
4.1	The charging elements in Annex A have been identified as being in need of network support mechanisms.
4.2	Administrations may elect to use all, none or any combination of the charging elements identified.
4.3	The charging elements and mechanisms are explained in Recommendation D.260.

ANNEX A
(to Recommendation D.232)
Summary of charging mechanisms and support
requirements for supplementary services

Supplementary
service	Element	Forma)	Unit	Modifier	
CLIP, CLIR	Access

Invocation	Subscription

Setup	UPC

UCI	None

None	
COLP, COLR	Access

Invocation	Subscription

Setup	UPC

UCI	None

None	
DDI, MSN	Access	Subscription	UPC	Quantity of
numbers
assigned	
Call Transfer 
Call Forwarding	Access

Invocation	Subscription

Setup	UPC

UCI	None

None	
Line hunting	Access	Subscription	UPC	Quantity of
interfaces	
Call Waiting
Call Hold	Access	Subscription	UPC	None	
Conference call 
Three Partyb)	Invocation

Usage	Setup

Call duration/
Number of ports	Uniform charge
per event

Holding time
per port	None	
Closed user
group	Access
(manager or
each party)	Subscription
per member	UPC	Services
required	
Advice of
charge	Access

Invocation	Subscription

Per request	UPC

UCI	None

Stage at which
invoked	
UPC	Uniform periodic charge (rental)
UCI	Uniform charge for (successful) invocation
a)	Subscription is included in normal rental or additional rental.
b)	Bridge is assumed in country of origin.