1、STD.ITU-T RECMN SERIES I SUPP 1-ENGL II778 m 4862591 0650563 b3b m INTERNATIONAL TELECOMMUNICATION UNION ITU-T TELECOMM U N KATION STANDARDIZATION SECTOR OF ITU Series I Supplement 1 (03198) SERIES I: INTEGRATED SERVICES DIGITAL NETWORK Service capabilities - Supplementary services in ISDN Generic s
2、ervice descriptions for ten supplementary services defined in 1.250 - Series Recommendations Supplement 1 to ITU-T I - Series Recommendations (Previously CCITT Recommendations) STD-ITU-T RECMN SERIES I SUPP 1-ENGL 1998 4862593 0650564 572 ITU-T I-SERIES RECOMMENDATIONS INTEGRATED SERVICES DIGITAL NE
3、TWORK GENERAL STRUCTURE Terminology Description of ISDNs General modelling methods Telecommunication network and service attributes General description of asynchronous transfer mode Scope General aspects of services in ISDN Common aspects of services in the ISDN Bearer services supported by an ISDN
4、Teleservices supported by an ISDN SUPPI services in ISDN Network functional principles Reference models Numbering, addressing and routing Connection types Performance objectives Protocol layer requirements General network requirements and functions Application of I-series Recommendations to ISDN use
5、r-network interfaces Layer I Recommendations Layer 2 Recommendations Layer 3 Recommendations Multiplexing, rate adaption and support of existing interfaces Aspects of ISDN affecting terminal requirements SERVICE CAPABILITIES OVERALL NETWORK ASPECTS AND FUNCTIONS ISDN USER-NETWORK INTERFACES INTERNET
6、WORK INTERFACES MAINTENANCE PRINCI PLES B-ISDN EQUIPMENT ASPECTS ATM equipment Transport functions Management of ATM equipment I. 1 lei. 1 19 1.1 20-1.129 I. 1 30-1.1 39 I. 140-I. 149 I. 150-1.199 I .20O-l.209 1.210-1.219 I .220-1.229 1.230-1.239 1.240-1.249 1.250-1.299 1.31 0-1.31 9 1.320-1.329 I.
7、3304.339 I. 3404.349 1.350-1.359 1.360-1.369 1.370-1.399 1.420-1.429 I .430-1.439 1.440-1.449 1.450-1.459 1.460-1.469 I .470-1.499 1.500-1.599 1.600-1.699 1.730-1.739 1.740-1.749 1.750-1.799 For further details, please refer to ITU-T List of Recommendations - STD.ITU-T RECMN SERIES I SUPP 1-ENGL 199
8、8 4862591 Ob50565 409 D SUPPLEMENT 1 TO ITU-T I-SERIES RECOMMENDATIONS GENERIC SERVICE DESCRIPTIONS FOR TEN SUPPLEMENTARY SERVICES DEFINED IN 1.250-SERIES RECOMMENDATIONS Source Supplement 1 to ITU-T I-Series Recommendations was prepared by ITU-T Study Group 2 (1997-2000) and was approved under the
9、WTSC Resolution No. 5 procedure on the 9th of March 1998. STD-ITU-T RECMN SERIES I SUPP 1-ENGL 1998 4862591 0650566 345 FOREWORD IT (International Telecommunication Union) is the United Nations Specialized Agency in the field of telecommunications. The ITU Telecommunication Standardization Sector (I
10、TU-T) is a permanent organ of the ITU. The ITU-T 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 World Telecommunication Standardization Conference (WTSC), which meets
11、every four years, establishes the 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. In some areas of information technol
12、ogy which fall within ITU-Ts purview, the necessary standards are prepared on a collaborative basis with IS0 and IEC. NOTE In this Recommendation, the expression “Administration“ is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. INTELLECTU
13、AL PROPERTY RIGHTS The ITU draws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed Intellectual Property Right. The ITU takes no position concerning the evidence, validity or applicability of claimed Intellectual Property Rights,
14、 whether asserted by ITU members or others outside of the Recommendation development process. As of the date of approval of this Recommendation, the ITU had not received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, implemento
15、rs are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent database. O IT 1998 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopy
16、ing and microfilm, without permission in writing from the IT. 11 I series - Supplement 1 (03198) STD- ITU-T RECMN O 1 1.1 1.2 1.3 1.4 1.5 2 2.1 2.2 2.3 2.4 2.5 3 3.1 3.2 3.3 3.4 3.5 4 4.1 4.2 4.3 4.4 4.5 SERIES I SUPP L-ENGL 1998 4862571 0650567 281 - CONTENTS Page Generic service description Call F
17、orwarding service . Definition Specific terminology Service description . Operation of the service from the users perspectives 1.4.1 Calling party 1.4.2 Called party . 1.4.3 Forwarded-to party Implementation considerations . Call Hold service Definition Specific terminology Service description . Ope
18、ration of the service from the users perspectives 2.4.1 Served user 2.4.2 Held user . Implementation considerations . Call Waiting supplementary service . Definition Specific terminology Service description . Operation of the service from the users perspectives 3.4.1 User A . 3.4.2 User C and user B
19、 Implementation considerations . Calling Line Information service . Definition Specific terminology Service description . Operation of the service from the users perspectives 4.4.1 Calling party 4.4.2 Called party . Implementation considerations . I series . Supplement 1 (03/98) 1 1 1 1 1 2 2 2 2 2
20、3 3 3 3 4 4 5 5 5 5 5 6 6 6 7 7 8 8 8 8 9 9 9 9 . 111 5 5.1 5.2 5.3 5.4 5.5 6 6.1 6.2 6.3 6.4 6.5 7 7.1 7.2 7.3 7.4 7.5 8 8.1 8.2 8.3 8.4 8.5 9 9.1 iv Calling Name Information Service . Specific terminology Service description . 5.4.1 Calling party Implementation considerations . Definition Operatio
21、n of the service from the users perspectives 5.4.2 Called party . Conference call. meet-me . Specific terminology Service description . Operation of the service from the users perspectives 6.4.1 Served user 6.4.2 Participants 6.4.3 Service provider Implementation considerations . Definition Explicit
22、 Call Transfer service . Definition Specific terminology Service description . Operation of the service from the users perspectives 7.4.1 Served user 7.4.2 Users B and C Implementation considerations . Multi-level Precedence and Preemption Service Definition Specific terminology Service description
23、. Operation of the service from the users perspectives 8.4.1 Calling party 8.4.2 Called party . Implementation considerations . Reverse Charging (REV) supplementary service . Definition I series . Supplement 1 (03/98) Page 10 10 10 10 11 11 11 11 12 12 12 12 13 13 13 14 14 14 14 14 15 16 16 17 17 17
24、 17 17 18 20 20 20 20 20 20 STD-ITU-T RECMN SERIES I SUPP 1-ENGL I1998 W 4862571 06505b9 054 M 9.2 9.3 9.4 9.5 10 10.1 10.2 10.3 10.4 10.5 Specific terminology Service description . Operation of the service from the users perspective 9.4.2 Called Party . Implementation considerations . 9.4.1 Calling
25、 Party Three-party service . Definition Specific terminology Service description . Operation of the service from the users perspectives 10.4.1 Served user 1 O . 4.2 Remote parties . Implementation considerations . Page 20 21 23 23 24 24 24 24 24 24 25 25 25 26 Appendix I . Informative references . 2
26、6 I series . Supplement 1 (03/98) V - - STDnITU-T RECMN SERIES I SUPP II-ENGL II998 = 4862591 Ob50570 876 m Supplement 1 to I-Series Recommendations GENERIC SERVICE DESCRIPTIONS FOR TEN SUPPLEMENTARY SERVICES DEFINED IN 1.250 SERIES RECOMMENDATIONS (Geneva, 1998) O Generic service description 1 Call
27、 Forwarding service 1.1 Definition The call forwarding service enables a called user to have incoming call to be forwarded to another user without being offered. Calls may be forwarded dependent of the status of the called user (e.g. busy, no reply) or unconditionally. 1.2 Specific terminology 1.2.1
28、 1.2.2 1.2.3 calling user: The originator of the call that is subjected to diversion. called user: A user that has activate the call forwarding. forwarded-to user: A user to whom the call is redirected as a result of forwarding(s). 1.3 Service description The service is offered to a called user to f
29、orward incoming calls. The call may be forwarded: - unconditionally; or - - The called user may receive an indication when the call is originated that the service has been activated, and when the network originates the call to the forwarded-to user that a call has been forwarded. The calling user ma
30、y receive an indication that the call has been forwarded. The forwarded-to user receiving a forwarded call may have an indication informing that the incoming call is a forwarded call. The called users ability to originate calls is unaffected by this service. A call may be diverted several times. In
31、case of multiple diversions, information may be provided to the called user or forwarded-to user as follows: - - - when the called user is busy; or when the called user doesnt answer to the incoming call. the number of the originally called user; the number of the last calling user; the reason of di
32、versions (e.g. busy, no reply). I series - Supplement 1 (03/98) 1 STD.ITU-T RECMN SERIES I SUPP II-ENGL 1998 m YB62591 Ob50571 702 m 1.4 Operation of the service from the users perspectives 1.4.1 Calling party 1.4.1.1 Normal operation No action is required on behalf of the calling party. 1.4.1.2 Opt
33、ional feature operation There is no optional feature operation for the calling party. 1.4.2 Called party 1.4.2.1 Normal operation The called user has to provide the number of the forwarded-to user when the service is activated. If the request of activation has been accepted, the called user may be i
34、nformed with the indication of the address of the forwarded-to user. 1.4.2.2 Optional feature operation There is no optional feature operation for the called party. 1.4.2.3 Exceptional procedures If the limit on the number of diversions has been reached, then the subsequent attempt to invoke the ser
35、vice shall be rejected. 1.4.3 Forwarded-to party 1.4.3.1 Normal operation No action is required on behalf of the forwarded-to party. 1.4.3.2 Optional feature operation There is no optional feature operation for the forwarded-to party. 1.5 Implementation considerations Some aspects need to be conside
36、red when implementing this service: a b c d e f) g What is the maximum number of diversions authorised for a call? For example, 5. Should any indication be provided to the called user? For example, an indication on the service activation, an indication that the call is forwarded. What information sh
37、ould be included in the indication? For example, the identity of the calling user, the reason for diversion, etc. Should any indication be provided to the calling user? For example, an indication that the call is going to be forwarded. Should any indication be provided to the forwarded-to user? For
38、example, an indication informing that the incoming call is a forwarded call. Should any indication be provided when the maximum number of diversions is reached? Will the network check the validity of the forwarding-to number provided by the called user? 2 I series - Supplement 1 (03/98) STDnITU-T RE
39、CNN SERIES I SUPP 1-ENGL 1998 48b2591 Ob50572 b49 h) i) j) Will the maximum number of diversions apply through dissimilar networks? Under what conditions shall a call be forwarded? For example, busy, no reply, etc. What is the timer value after which the call is forwarded when the called user does n
40、ot answer the call? 2 Call Hold service 2.1 Definition The call hold service allows a user to interrupt communications on an existing call and then, subsequently, if desired, re-establish communications. The Call Hold service includes the retrieve operation that re-establishes the call between the s
41、erved user and the held party. 2.2 Specific terminology No terminology specific to this Supplement has been identified. 2.3 Service description When the Call Hold service is invoked, communication on a call is interrupted and the call is released from use. Depending on the implementation, a path may
42、 or may not be reserved after the communication is interrupted to allow the origination or possible termination of other calls. Reservation may be provided by the service provider as a user option. When the served user wishes to re-establish communications, the retrieve operation is requested. The s
43、uccess of the retrieve operation depends on whether a path was reserved and whether a path is currently available to the served user. NOTE - Figures 2-1 and 2-2 provide examples of the normal procedures of the Cali Hold supplementary service. They are not intended to cover all possible normal scenar
44、ios. The terminal representations in these figures are used for graphic purposes only and are not intended to suggest that other end user equipment is not applicable. A-B Call I) Answered 2) Served user requests for Call Hold 3) A-B communication is suspended Network T0207020-98 . . . . User A (Serv
45、ed user) Cali held User B Figure 2-1 - Example scenario during invocation of Call Hold I series - Supplement 1 (03/98) 3 A-B Call I) Served user A requests retrieval of a held call 2) If path is available, the connection is re-established Network . . . . . . . . . . . . . . . . . . . . . . . . TO207
46、030-98 . _ _ _. . . W User A (Served user) Connection re-established User B Figure 2-2 - Example scenario during retrieval of Held Call 2.4 Operation of the service from the users perspectives 2.4.1 Served user 2.4.1.1 Normal operation The served user indicates to the network that the current call i
47、s to be interrupted. A call may be placed on hold by either the calling or called served user. The communication on the interface is then interrupted. The network acknowledges this action, and the associated path is made available for other uses. If at any time a call is in the held state, either pa
48、rty may disconnect from the call. 2.4.1.2 Optional feature operation 2.4.1.2.1 Reserved path operation If path reservation is subscribed to, a connection path is reserved for use by the given terminal used to invoke the Call Hold service. When a user (as identified by a terminal) places a call on ho
49、ld and reservation applies, a connection path should always be available to that user so that the user may retrieve that call from hold, or establish, retrieve or connect to another call. One connection path should be kept available for the user as long as the user: i) ii) Hence, the network should not reserve more than one path for the terminal used to invoke the Call Hold service. In some implementations, the served user may optionally indicate a path selection parameter in the retrieve request. The parameter may indicate: 1
