1、ITU-T RECMN*Q=95b CLAUSE*2 95 48b2593 0632288 445 INTERNATIONAL TELECOMMUNICATION UNION ITU-T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU DIGITAL SUBSCRIBER SIGNALLING SYSTEM No. 1 Q.956 (1 0/95) INTEGRATED SERVICES DIGITAL NETWORK FOR CHARGING SUPPLEMENTARY SERVICES USING DSS 1 (ISDN) - STAGE 3
2、 SERVICE DESCRIPTION * Clause 2 - Advice Of Charge (AOC) ITU-T Recommendation Q.956 (Previously ?CCIlT Recommendation?) 1u-T REC!N*Q.956 CLAUSES2 95 m 4862593 Ob32289 381 FOREWORD The ITU-T (Telecommunication Standardization Sector) is a permanent organ of the International Telecommunication Union (
3、IT). The ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommen- dations on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Conference (WTSC), which meets every four years, establishes th
4、e topics for study by the ITU-T Study Groups which, in their turn, produce Recommendations on these topics. The approval of Recommendations by the Members of the ITU-T is covered by the procedure laid down in WTSC Resolution No. 1 (Helsinki, March 1-12, 1993). ITU-T Recommendation Q.956, clause 2, w
5、as prepared by ITU-T Study Group 11 (1993-1996) and was approved under the WTSC Resolution No. 1 procedure on the 17th of October 1995. NOTE In this Recommendation, the expression “Administration” is used for conciseness to indicate both a telecommunication administration and a recognized operating
6、agency. - O ITU 1996 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. ITU-T RECMNUQ.956 CLAUSEU2 95 4862593 Ob12290 OT3 = CONTENTS 2
7、Advice Of Charge (AOC) 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 2.10 2.11 2.12 2.13 2.14 Scope References . Definitions Abbreviations Description Coding requirements . State definitions Signalling procedures at the coincident S and T reference point Procedures for interworking with private ISDNs . Intera
8、ctions with other networks . Interaction with other supplementary services . Parameter values (timers) . Dynamic description (SDLs) Operational requirements Appendix I . Signalling flows . Page 1 1 1 2 3 3 4 4 8 8 14 15 15 26 26 37 Recommendation Q.956 (10/95) 1 ITU-T RECflN*Q*95b CLAUSE*2 95 M i862
9、591 Ob12291 T3T SUMMARY This Recommendation defines the operation of the Digital Subscriber Signalling System No. 1 (DSS 1) for the support of the Advice Of Charge (AOC) Supplementary service at the T or the coincident S and T reference point of the User-to-Network interface of the Integrated Servic
10、es Digital Network (ISDN). The Advice Of Charge supplementary service allows the served user to request the network to provide charging information at call establishment time (AOC-S), during the call (AOC-D), or at the end of the call (AOC-E). Depending on the subscribed options, this charging infor
11、mation may be provided either for all calls or only for the calls for which an explicit request is made. II Recommendation Q.956 (10195) ITU-T RECMN*Q=95b CLAUSE*2 95 4862591 0612272 97b Recommendation Q.956 INTEGRATED SERVICES DIGITAL NETWORK (ISDN) - STAGE 3 SERVICE DESCRIPTION FOR CHARGING SUPPLE
12、MENTARY SERVICES USING DSS 1 (Geneva, 1995) 2 Advice Of Charge (AOC) 2.1 Scope This Recommendation specifies the stage three of the Advice of Charge (AOC) supplementary service for the Integrated Services Digital Network (ISDN) at the T reference point or coincident S and T reference point (as defin
13、ed in Recommendation 1.41 1 i) by means of the Digital Subscriber Signalling System No. 1 (DSS 1). Stage three identifies the protocol procedures and switching functions needed to support a telecommunications service (see Recommen- dation 1.130 2). In addition, this Recommendation specifies the prot
14、ocol requirements at the T reference point where the service is provided to the user via a private ISDN. This Recommendation does not specify the additional protocol requirements where the service is provided to the user via a telecommunications network that is not an ISDN. The AOC supplementary ser
15、vice allows the served user to be informed of usage-based charging information. The AOC supplementary service is not meant to replace the charge metering inside the network which is considered to be correct in all cases. Three AOC supplementary services exist: a) Charging information at call set-up
16、time (AOC-S) The AOC-S supplementary service enables a user to receive information about the charging rates at call Set-up time and also to receive further information during the call if there is a change of charging rates. Charging information during the call (AOC-D) The AOC-D supplementary service
17、 enables a user to receive information on the recorded charges for a call during the active phase of the call. Charging information at the end of the call (AOC-E) The AOC-E supplementary service enables a user to receive information on the recorded charges foca call when the call is terminated. b) c
18、) The AOC supplementary service is applicable to all circuit-switched telecommunication services. Further part(s) of this Recommendation shall specify the method of testing required to identify conformance to this Recommendation. This Recommendation is applicable to equipment, supporting the AOC sup
19、plementary service, to be attached at either side of a T reference point or coincident S and T reference point when used as an access to the public ISDN. 2.2 References The following Recommendations and other references contain provisions which, through reference in this text, constitute provisions
20、of this Recommendation. At the time of publication, the editions indicated were valid. All Recommendations and other references are subject to revision; all users of this Recommendation are therefore encouraged to investigate the possibility of applying the most recent edition of the Recommendations
21、 and other references listed below. A list of the currently valid ITU-T Recommendations is regularly published. i 2 ITU-T Recommendation 1.41 1 (1993), ISDN user-network interfaces - Reference configurations. CCIT Recommendation I. 130 (1988), Method for the characterization of telecommunication ser
22、vices supported by an ISDN and network capabilities of an ISDN. Recommendation Q.956 (10/95) 1 ITU-T RECMN*6!.95b CLAUSEg2 95 m 4862591 Ob22293 802 m ITU-T Recommendation 1.1 12 (1993), Vocabulary of terms for ISDNs. ITU-T Recommendation Q.93 1 (1993), Digital subscriber Signailing System No. 1 (DSS
23、 I) - ISDN user-network interface layer 3 specification for basic call control. ITU-T Recommendation 4.932 (1993), Digital subscriber Signalling System No. 1 (DSS 1) - Generic procedures for the control of ISDN supplementary services. CCIT Recommendation X.208 (1988), Specification of Abstract Synta
24、r Notation One (ASN. 1). CCITT Recommendation X.219 (1988), Remote operations: Model, notation and service definition. ITU-T Recommendation Q.952 (1993), Stage 3 service description for call offering supplementary services using DSS 1 - Diversion supplementary services. ITU-T Recommendation 2.100 (1
25、993), CCIIT specification and description language (SOL). Definitions For the purposes of this Recommendation, the following definitions apply: 2.3.1 service; telecommunications service: See 2.2A.112 3, definition 201. 2.3.2 information should be provided (for all calls or on request). served user:
26、The served user is the user of a particular ISDN number, who is requesting that charging 2.3.3 2.3.4 the call state at either the network or the user. basic communication: This charged item indicates the rate to be applied for the connection to the called user. call control message: A message as def
27、ined in 3.UQ.931 4 which on sending or receipt causes a change of 2.3.5 the called user has not yet answered the call. call attempt: This charged item indicates the cost applied for a call which has been sent to the called user, but 2.3.6 user answers the call. call Set-up: This charged item indicat
28、es the cost applied for the connection to the called user when the called 2.3.7 2.3.8 calculating the cost of the call. and the user to which it is sent. network: The DSS 1 protocol entity at the network side of the user-network interface. special charging arrangement: This charged item indicates th
29、at a special charging arrangement exists for NOTE -The use of this charged item is outside the scope of this Recommendation. It is a matter for the network operator 2.3.9 to-user information. user-to-user information transfer: This charged item indicates the rate to be applied to the transfer of use
30、r- 2.3.10 have been incurred due to the indicated situation (e.g. a call that has been forwarded at the served users access). billing identification: Elements for billing identification informs the served user that the associated charges 2.3.11 call. recorded charges: This information indicates the
31、number of charging units or currency units incurred for a 2.3.12 flat rate: This specific rate indicates a fixed currency value per event. 2.3.13 used as a basis for determining the cost of a call. 2.3.14 charging information: Information sent to a user in an invoke component or a return result comp
32、onent showing charging-related information (i.e. either charging rate information, special charging rates, or the recorded charges for the call). The invoke, return result and return error components are defined in Recommendation 4.932 5. 2.3.15 special service or for the operation of requested supp
33、lementary services. special charging code: This specific code indicates a rate which can identify a charging algorithm that can be special service or operation of supplementary services: This charged item indicates the cost applied for a 2 Recommendation Q.956 (10195) ITU-T RECMN*d.956 CLAUSE*2 95 =
34、 4862591 0622294 749 2.3.16 2.3.17 invoked for the same call. user: The DSS 1 protocol entity at the user side of the user-network interface. local interaction for the call: The local interaction exists on a single call, i.e. both supplementary services are 2.4 Abbreviations For the purposes of this
35、 Recommendation, the following abbreviations are used: AOC Advice Of Charge AOC-S AOC-D AOC during the call AOC-E ASN. 1 DSS 1 ISDN Integrated Services Digital Network PSTN Public Switched Telephone Network AOC at call Set-up time AOC at the end of the call Abstract Syntax Notation One Digital Subsc
36、riber Signalling System No. 1 2.5 Description Depending on subscription by the served user, charging information for any of the three services may be provided either: - for all calls; or - for any call, after a user request to provide charging information. The charging information given shall relate
37、 to the charges incurred on the network to which the user is attached. Charging information for applications using higher layer protocols which are not defined as teleservices, shall be based on the bearer services specified. 2.5.1 When the AOC-S supplementary service is activated, the network shall
38、 provide the user with information about the charging rates at call establishment. In addition, the network shall inform the served user if a change in charging rates takes place during the call. The network shall provide the charging information during call establishment or at the latest at call co
39、nnection. When there is a change in the charging rate during the call, the network shall send information about the new charging rate JO the served user. Charging information at call Set-up time 2.5.2 When the AOC-D supplementary service is activated, the network shall provide the user with charging
40、 information for a call during the active phase of a call. The network shall provide the charging information and transfer it to the served user in an appropriate message. The supplied charging information shall be provided as a cumulative charge incurred so far for the call (i.e. charges recorded f
41、rom the start of the call and until the moment the charging information is sent to the served user). Charging information during a call When the call is released, the network shall send the recorded charges for the call to the served user in one of the call control messages clearing the call. If a c
42、all is free of charge to the served user, the network shall send the free-of-charge indication in the first message sent to the served user. The network shall not send any further charging information during the call. When the call is released, the network shall send the charged amount (zero) in a c
43、all control message clearing the call. 2.5.3 When the AOC-E supplementary service is activated, the network shall provide the served user with charging information indicating the recorded charges for a call when the call is released. The network shall send the charging information to the served user
44、 in one of the call control messages clearing the call. Charging information at the end of a call Recommendation Q.956 (10/95) 3 ITU-T RECMNmcQ.956 CLAUSE*2 95 48b2591 Ob12295 685 9 Subscription options Provision of service 2.6 Operational requirements 2.6.1 Provisiodwithdrawal These supplementary s
45、ervices shall be provided separately by anangement with the service provider or be generally available. Withdrawal of the service shall be made at subscriber request or for administrative reasons. The following subscription options exist for each of the three AOC supplementary services, as defined i
46、n Table 2- 1. Value I) For all calls; or 2) On request on a per call basis TABLE 2-1/Q.956 2.6.2 The originating network side shall make available the type of charging information that is indicated, related to a certain call. Requirements on the originating network side The Originating network side
47、shall assemble the appropriate charging information, according to the service requirements, and send it to the user. NOTE - The charging information may either be generated at the originating network, or generated elsewhere and sent to the originating network, in due time for the information to be p
48、rovided to the user according to the procedures of this Recommendation. The network shall only include a charged item if the charged item contains information concerning the charges applied to that call. The network shall only use those charged items which are appropriate to that network charging me
49、chanism. Thus, in some networks, the network may, but need not, send some of these items or combinations of items. Different networks could give information about the same call in different ways. - If the served user suspends a call, then as a network option the originating network side shall retain the charging information for the suspended call as long as the network retains the call identity of the served users suspended call. 2.6.3 Requirements on the destination network side None identified. 2.7 Coding requirements 2.7.1 General The charging information that the netw
