1、ETS 300 056 October 1991 UDC: 621.395 Key words: ISDN, supplementary service. Integrated Services Digital Network (ISDN); Call Waiting (CW) supplementary service Servi ce description ETSI European Telecommunications Standards Institute ETSI Secretariat: B.P.152 . F - 06561 Valbonne Cedex . France TP
2、. + 33 92 94 42 O0 TF. + 33 93 65 47 16 Tx. 47 O0 40 F European Telecommunications Standards Institute 1 991 . All rights reserved. No part may be reproduced or used except as authorised by contract or other written permission. The copyright and the foregoing restriction ,on reproduction and use ext
3、end to all media in which the information may be embodied. Page 2 ETS 300 056:1991 _ Whilst every care has been taken in the preparation and publication of this document, errors in content, typographical or otherwise, hay occur. If you have comments concerning its accuracy, please write to “ETSI Sta
4、ndards Management Dept.“ at the address shown on the title page. . - C ETSI ETS*300*05b 73 3400855 0344726 4541 Page 3 ETC 300 056:1991 Con tents Foreword 5 1 Scope . 7 2 Normative references 7 3 Definitions 8 4 Symbols and abbreviations . 9 5 Description 9 6 Procedures 9 6.1 6.2 6.3 Provision and w
5、ithdrawal 9 Activation. deactivation and registration . 10 Invocation and operation . 10 Interface resources in use . 10 Subscriber resources in use 11 6.2.4 Interrogation . 11 6.3.1 Activation. deactivation and registration . 11 6.3.2 Erasure 11 6.3.3 Invocation and operation . 11 Maximum number of
6、 waiting calls reached 11 No positive response from terminals at the access of subscriber 6 . 11 Incoming call from user C rejected by user B 11 Normal procedur es 1 0 6.2.2 Erasure 1 0 6.2.1 6.2.3 6.2.3.1 6.2.3.2 Exceptional procedures 11 6.3.3.1 6.3.3.2 6.3.3.3 6.3.3.4 6.3.3.5 6.3.3.6 No resources
7、 available . 12 Incoming call from user C ignored by subscriber B 12 Release by user C within the specified period . 12 6.3.4 Interrogation . 12 7 Intercommunication considerations 12 Interworking with non-ISDNs 12 Interworking with private ISDNs . 12 7.1 7.2 8 Interaction with other supplementary s
8、ervices . 12 8.1 8.2 8.3 8.4 8.5 Advice of charge . 12 Charging information at call set up time 12 8.1 -1 8.1.2 8.1.3 Charging information during the call 12 Charging information at the end of the call . 12 Call waiting 13 Call hold 13 Call transfer services . 13 Explicit call transfer . 13 Single s
9、tep call transfer . 13 Number identification services . 13 Calling line identification presentation 13 Calling line identification restriction 13 Connected line identification presentation . 13 Connected line identification restriction . 13 8.4.1 8.4.2 8.5.1 8.5.2 8.5.3 8.5.4 Page 4 ETS 300 456:1991
10、 8.6 8.7 8.8 8.9 8.10 8.1 1 8.12 8.13 8.14 8.15 8.16 8.17 Closed user group . 13 Completion of calls to busy subscriber . 14 Conference services 14 Conference call. add-on 14 Meet me conference 14 Direct dialling in 14 Diversion services 14 8.10.1 Call forwarding unconditional . 14 8.10.2 Call forwa
11、rding busy 14 8.10.3 Call forwarding no reply 14 8.10.4 Call deflection 15 Freephone . 15 Malicious call identification 15 Multiple subscriber number 15 Subaddressing 15 Terminal portability . 15 Three party 15 8.8.1 8.8.2 User-user signalling 15 C ETSI ETS*300*056 91 3400855 0344928 227 Page 5 ETS
12、300 056:1991 Foreword This European Telecommunication Standard (ITS) has been produced by the Network Aspects (NA) Technical Committee of the European Telecommunications Standards Institute (ETSI). In accordance with CCRT Recommendation 1.130 l, the following three level structure is used to describ
13、e the supplementary telecommunications services as provided by European public telecommunications operators under the pan-European Integrated Services Digital Network (IS D N) : - Stage 1: is an overall service description, from the users standpoint; - Stage 2: identifies the functional capabilities
14、 and information flows needed to support the service described in stage 1; and - Stage 3: defines the signalling system protocols and switching functions needed to implement the service described in stage 1. This ETS details the stage 1 aspects (overall service description) for the Call Waiting (CW)
15、 supplementary service. The stage 2 and stage 3 aspects are detailed in ETS 300 057 (1991) and ETC 300 058 (1991), respectively. Page 6 ETS 300 056:1991 Blank page C ETSI ETS*300*056 91 3400855 0144930 985 Page 7 ETS 300 056:1991 1 Scope This standard defines the stage one of the Call Waiting (CW) s
16、upplementary service for the pan-European Integrated Services Digital Network (ISDN) as provided by European public telecommunications operators. Stage one is an overall service description from the users point of view, but does not deal with the details of the human interface itself (see CCllT Reco
17、mmendation 1.130 l. This standard defines the interworking requirements of private ISDNs with the public ISDN. In addition this standard specifies the base functionality where the service is provided to the user via a private ISDN. This standard does not specify the additional requirements where the
18、 service is provided to the user via a telecommunications network that is not an ISDN but does include interworking requirements of other networks with the public ISDN. Interactions with supplementary services not listed in Clause 8 are outside the scope of this standard. Charging principles are out
19、side the scope of this standard. The Call Waiting (CW) supplementary service permits a user to be informed of an incoming call (as per basic call procedures) with an indication that no interface information channel is available. The user then has the choice of accepting, rejecting or ignoring the wa
20、iting call (as per basic call procedures). The CW supplementary service is considered meaningful when applied to the telephony teleservice and the speech and 3,l kHz audio bearer services. Furthermore, it can be applied to other circuit-switched services. This standard is applicable to the stage two
21、 and stage three standards for the ISDN CW supplementary service. The terms “stage two“ and “stage three“ are also defined in CCill Recommendation 1.130 l. Where the text indicates the status of a requirement, (.e. as strict command or prohibition, as authorisation leaving freedom, as a capability o
22、r possibility) this shall be reflected in the text of the relevant stage two and stage three standards. Furthermore, conformance to this standard is met by conforming to the stage three standards with the field of application appropriate to the equipment being implemented. Therefore no method of tes
23、ting is provided for this standard. 2 Normative references This standard incorporates, by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subseq
24、uent amendments to, or revisions of any of these publications apply to this standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. CCRT Recommendation 1.130 (1988): “Method for the characterisation of telecomm
25、unication services supported by an ISDN and network capabilities of an ISDN“. 21 CCTT Recommendation 1.1 12 (1988): “Vocabulary of terms for ISDNs“. 31 CCRT Recommendation 1.221 (1 988): “Common specific characteristics of services“. - ( ETSI ETS*300*05b 93 3400855 03447311 Page 8 ETS 300 056:1991 C
26、CiTl Recommendation E.164 (1988): “Numbering era“. SI CCm Recommendation 1.210 (1988): “Principles of 81111 plan for the ISDN telecommunication services supported by an ISDN and the means to describe them“. GI CCTTT Recommendation (2.9 (1 988): “Vocabulary of switching and 3 Definitions For the purp
27、oses of this standard, the following definitions apply: Basic call (procedures): the procedures by which a call (as an instance of a basic telecommunications service) is established and terminated. User determined user busy (UDUB): see CCTTT Recommendation 1.221 3, 9 3.1.4. interfaco resources: see
28、CCllT Recommendation 1.221 (31, 9 3.1.2. Subscriber resources: see CCTTT Recommendation 1.221 (31, 5 3.1.2. Resources busy: see CCITT Recommendation 1.221 3, Q 3.1.2 and Q 3.1.3. Channels busy: see CCTTT Recommendation 1.221 3, fj 3.1.3. Network determined user busy (NDUB): see CCITT Recommendation
29、1.221 3, 0 3.1.4. Servlce; telecornrnunlcatlons service: see CCllT Recommendation 1.1 12 2j, 0 2.2. definition 201. Supplementary service: see CCilT Recommendation 1.210 5, 6 2.4. Bearer service: see CCITT Recommendation 1.1 12 2, 9 2.2. definition 202. Teleservlce: see CCITT Recornmendation 1.1 12
30、2, 0 2.2, definition 203. ISDN number: A number conforming to the numbering plan and structure specified in CCITT Recommendation E.164 4. Integrated Services Digital Network (ISDN): see CCITT Recommendation 1.112 2, 0 2.3, definition 308. Subscriber B: Subscriber B is the subscriber who is provided
31、by the network with the CW supplemenmy service on a particular interface. User 6: User B is the one user who reacts to the call waiting at subscriber B. User C: User C is the user who has originated a call to subscriber B which causes the CW supplementary service to be invoked. User A: User A is a u
32、ser who is engaged in a call with user B (this call can be in any state). Ti; User response time-out: The duration of this time oui is the time the network will wait for a positive response from a terminal at 8, to the offered call. It is part of the basic call and has a value of a few seconds. sign
33、alling terms“. ( ETSI ETS*300*05b 91 m 3400855 0144932 758 = Page 9 ETS 300 056:1991 T2; No answer time-out (servlce provider option): The duration of this time-out is the time the network will wait for an acceptance (answer) of the offered call from user C, by user B. The value of this timer is bet
34、ween 30 seconds and two minutes. If T2 is not provided, the basic call time-out on awaiting answer will be used. Bask access: see CCm Recommendation (2.9 SI, 0 1, definition 1551. Prlmary rate access: see CCm Recommendation Q.9 6, 5 1, definition 1552. 4 Symbols and abbreviations ISDN Integrated Ser
35、vices Digital Network cw Call Waiting NDUB Network Determined User Busy UDUB User Determined User Busy 5 Description The CW supplementary service shall apply to the basic access and primary rate access. The CW supplementary service permits a user to be informed of an incoming call (as per basic call
36、 procedures) with an indication that no interface information channel is available. The user has then the choice of accepting, rejecting or ignoring the waiting call (as per basic call procedures). The CW supplementary service shall operate when all appropriate 6 channels of the access to the termin
37、al(s) of subscriber 6 are busy. Moreover, when at least one Bchannel is free, any compatible busy terminal of subscriber B can react positively to an incoming call. When a third party (calling user C) attempts to connect to that termination, subscriber B shall be given an appropriate indication of t
38、he waiting call. The maximum number of calls that can be handled (e.g. active, held, alerting, waiting) for each ISDN number on a given interface shall be a network option. NOTE: It is recognised that a small call-connect system or an active bus may be present at customers premises and that an inter
39、nal call may be in progress when the call waiting indication is applied. It is assumed that it is the responsibility of the customers equipment to determine what action should take place in these circumstances. 6 Procedures 6.1 Provision and withdrawal The CW supplementary service shall either be pr
40、ovided on a subscription basis or, as a network option, be generally available to all users without subscription. The CW supplementary service can be withdrawn at the request of the customer or for administrative reasons. NOTE: The maximum number of information channels which can be used (occupied)
41、on the interface for each ISDN number, all ISDN numbers or subsets of ISDN numbers can be described in each applicable bearer service and teleservice. Call waiting for bearer services or teleservices occurs only when an attempt is made to exceed these limits. c ETSI ETS*300*05b 93 3400855 0344933 69
42、4 Subscription Option Page 10 ETS 300 056:1991 Value As a network option, call waiting may be offered with the following subscription option (see table 1). The option shall apply separately to each ISDN number and service combination. Calling user receives notification that their call is waiting Tab
43、le 1 No Yes Network option Maximum number of calls which can be waiting Value One N, where N is more than one The network option in table 2 can be specified for each ISDN number, all ISDN numbers, or subsets of ISDN numbers on each interface. Table 2 The use of T2 is a service provider option. When
44、used, the value of T2 shall be set by the service provider as a default value subject to change only by the service provider. 6.2 Normal procedures 6.2.1 Activa tion, dea ctlva tlon and reg irra tlon The CW supplementary service shall be activated by the service provider at provision. The CW supplem
45、entary service shall be deactivated by the service provider at withdrawal. Registration shall not apply. 6.2.2 Erasure Not applicable. 6.2.3 invocation and operation 6.2.3.1 Interface resources In use When an incoming call from user C arrives at the access of subscriber B and encounters the channels
46、 busy condition and a NDUB condition does not result, then the CW supplementary service shall be invoked and the call shall be offered to subscriber B with an indication that the channels busy condition exists. If a response is received from at least one terminal at the access of subscriber E3 withi
47、n T1 indicating that the user is being informed about the incoming call, then user C shall be given the normal indication that the call is being offered to the called user. In some networks this indication can also indicate that call waiting is in operation. depending on the value of the subscriptio
48、n option of user B. Page 11 ETS 300 056:1991 If either user A or user B requests that the active call is terminated, then this call shall be terminated as for basic call. User B shall then be able to accept the waiting call from user C before the expiry of T2. User B can also free resources by using
49、 the call hold supplementary service. User B shall then be able to accept the waiting call from user C before the expiry of T2. 6.2.3.2 Subscriber resources in use When an incoming call from user C arrives at the access of subscriber B and there is a B- channel available, the call shall be indicated to subscriber B. If a terminal at the access of subscriber B is busy because of another call but that terminal is able to accept the incoming call from user C, it shall indicate to the network that the called user is being in
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