ITU-T Q 733 1-1992 Stage 3 Description for Call Completion Supplementary Services Using No 7 Signalling System Section 1 - Call Waiting (CW)《使用No 7信令系统的呼叫完成补充业务第3阶段描述 呼叫等待(CW)》.pdf

1、CCITT RECMN*Q-733 92 m 4862591 0573195 13L m INTERNATIONAL TELECOMMUNICATION UNION CCITT THE INTERNATIONAL TELEGRAPH AND TELEPHONE CONSULTATIVE COMMITTEE SPEC1 FI CATIONS OF SIGNALLING SYSTEM No. 7 Q.733 STAGE 3 DESCRIPTION FOR CALL COM PLETION SUPPLEMENTARY SERVICES USING No. 7 SIGNALLING SYSTEM SE

2、CTION 1 - CALL WAITING (CW) Recommendation Q.733 Geneva, 1992 CCITT RECMN*Q-733 92 m 48b2591 057319b 078 m INTERNATIONAL TELECOMMUNICATION UNION CCITT THE INTERNATIONAL TELEGRAPH AND TELEPHONE CONSULTATIVE COMMITTEE SPECIFICATIONS OF SIGNALLING SYSTEM No. 7 Q.733 STAGE 3 DESCRIPTION FOR CALL COM PLE

3、TION SUPPLEMENTARY SERVICES USING No. 7 SIGNALLING SYSTEM SECTION 1 - CALL WAITING (Cw) Recommendation Q.733 Geneva, 1992 CCITT RECflN*Q*733 92 W 4862571 0573197 TOq W FOREWORD The CCFTT (the International Telegraph and Telephone Consultative Committee) is a permanent organ of the intedonal Telecomm

4、unication Union o. CCFTT is responsible for studying technical, operaihg and tariff questions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis. The Plenary Assembly of CC which meets every four years, esablishes the topics for study and approve

5、s Recommendations prepared by its Study Groups. The approval of Recommendations by the members of CC between Plenary Assemblies is covered by the procedure laid down in CC Resolution No. 2 (Melbourne, 1988). Recommendation Q.733,8 1 was prepared by Study Group XI and was approved under the Resolutio

6、n No. 2 procedure on the 4th of February 1992. CCiT NOTE In this Recommenation, the expression “Administration“ is used for conciseness to indicate both a telmmmunication Administration and a recognized private operating agency. O ITU 1992 All rights reserved. No part of this publication may be repr

7、oduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the . CCITT RECMN*d.733 92 m 48b2591 0573198 940 m Recommendation Q.733 STAGE 3 DESCRIPTION FOR CALL COMPLETION SUPPLEMENTARY SERVICES USING SIGNALLING S

8、YSTEM No. 7 1 Call Waiting (CW) 1.1 Definition The CW supplementary service permits a subscriber to be notified 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 t

9、he waiting call (as per basic call procedures). 1.2 Description 1.2.1 General description The ISDN Call Waiting supplementary service allows to notify a subscriber of an incoming call. 1.2.2 Specc terminology Throughout the stage 3 description of Call Waiting, the following terminology wiii be used:

10、 Subscriber B: this is the subscriber who is provided by the network with the Call Waiting supplementary User A: User B: User C: service on a particular interface. this represents a user who is engaged in a call with the user B. this is the user who reacts to the call waiting at B. this is the user

11、who has originated a call to B which causes the call waiting supplementary service to be invoked. 1.2.3 Qualijcation on the applicability to telecommunication services Same as 0 1.2.3 of Recommendation 1.253 1.2.4 State dejnitions No specific state definitions are required. 1.3 Operational requireme

12、nts 1.3.1 Provision and withdrawal The CW supplementary service shall either be provided on a subscription basis or, as a network provider option, be generally available to all users without subscription. Withdrawal shall be at the request of the subscriber or for administrative reasons. As a networ

13、k provider option, CW can be offered at the destination exchange with the following subscription the destination exchange sends a notification to the calling user that his call is waiting. option: 1.3.2 Requirements on the originating network side Not applicable. 1.3.3 Requirements in the network No

14、 specific requirements are needed in the network. Recommendation Q.733 1 CCITT RECMN*Q-733 92 m Y862593 0573399 887 m 7 6 5 4 3 2 1 1.3.4 Requwements on the terminating network side Not applicable. Description 1.4 Coding requirements The following notification description is used: - callisawaitingca

15、ll. The Generic Notification Indicator parameter field shall be coded as shown in Table 1-UQ.733: 1 1 O O O O O TABLE 1-UQ.733 CaUisaWaitingCa Generic Notification Indicator parameter field I The Generic Notification Indicam parameter is accompanied by the parameter Compatibility Information paramet

16、er. The procedures for the compatibfity are defmed in Recommendation 4.764. 1.5 Signalling requirements 1.5.1 Activatioddeactivatiodregistration Not applicable. 1.5.2 Invocation and operation 1.5.2.1 Actions at the originating local exchange 1.5.2.1.1 Noma1 operation complete message or call progres

17、s message, the calling user C is informed that his call is waiting. if the call waiting indication is contained in the Notification Indicator parameter field of the address 1.5.2.1.2 Exceptional procedures No exceptional procedures are required. 1.5.2.2 Actions at the transit exchange 1.5.2.2.1 Norm

18、al operation A transit exchange sha transfer the notifcation indication transparently to the succeeding exchange. 1.5.2.2.2 Exceptional procedures No exceptional procedures are required. 1.5.2.3 1.5.2.3.1 Normal operation Actions at the outgoing internutwnal gateway exchange An outgoing internationa

19、l gateway exchange shall transfer the notification indication transparently to the succeeding exchange. 2 Recommendation 4.733 CCITT RECMNuQ.733 92 4862591 0573200 329 1.5.2.3.2 Exceptional procedures No exceptional procedures are required, 1.5.2.4 1.5.2.4.1 Normal operation Actions at the incoming

20、internutianal gateway exchange An incoming international gateway exchange shall transfer the notification indication transparently to the succeeding exchange. 1.5.2.4.2 Exceptional procedures In the case of interworking with networks not supporting the CW Supplementary service, the incoming internat

21、ional gateway exchange shall discard the notificaton indication and the call will be completed according to the basic call procedure as described in Recommendation Q.764. 1.5.2.5 1.5.2.5.1 Normal operation As a subscription option the destination exchange shall include the call waiting indication in

22、 the Notification Indicator parameter field and send it within the address complete message or call progress message to the Originating exchange as the result of the receipt of an alerting message at the user-network interface. Actions at the destination local exchunge Note -See Figures 1-UQ.733 and

23、 1-2/Q.733 of 6 1.8. 1.5.2.5.2 Exceptional procedures % After the alerting message has been sent by subscriber B to the network (user alerted), tbis incoming call can be rejected by the user. A release message is sent to user C with cause #i21 (call rejected). Note - See Figure 1-3/Q.733 of 8 1.8. A

24、fter expiry of the call waiting supervision timer at the user-network interface (see Recommendation 4.93 1, 0 9) the network initiates clearing procedures. A release message is sent to user C with cause #19 (no answer from user, user alerted). Note -See Figure 14Q.733 of 6 1.8. Call Waiting (CW) Not

25、 applicable. Call Transfer (CT) No applicable interaction at this time. Calling Line Identijcation Presentation (CUP) No impact OQ ISUP. Calling Line Identijication Restriction (CUR) No impact on ISUP. Connected Line Identification Presentation (COU) No impact on ISUP. 1.6 Interactions with other su

26、pplementary services Note 4 - When “no impact” stands alone, please read: i.e. neither supplementary service affects the operation of the other supplementary service. 1.6.1 1.6.2 1.6.3 1.6.4 I 1.6.5 Recommendation Q.733 3 1.6.6 1.6.7 1.6.8 1.6.9 1.6.10 CCITT RECMN*Q-733 92 m 4862593 0573201 265 m Co

27、nnected Line Identification Restriction (COU) No impact on ISUP. Closed User Group (CUG) No impact on ISUP. Conference Calling (CONF) No impact on ISUP. Direct- Dialling-Zn (DDZ) No impact on ISUP. Call Diversion services (CDW) 1.6.10.1 Call Forwarding Busy (CFB) No impact on ISUP. 1.6.10.2 Call For

28、warding No Reply (CFNR) No impact on ISUP. 1.6.10.3 Call Forwarding Unconditional (CFU) No impact on ISUP. 1.6.10.0 Call Deflection (CO) 1.6.11 1.6.12 1.6.13 1.6.14 1.6.15 1.6.16 1.6.17 1.6.18 1.6.19 4 No impact on ISUP. Line Hunting (LH) The Cail Waiting supplementary service should not be provided

29、 to a line in a hunt group. Three-Party Service (3PTY) No impact on ISUP. User-to-User Signalling (UUS) No impact on ISUP. Multiple Subscriber Number (MSN) No impact on ISUP. Call Hold (CH) No impact on ISUP. Advice of Charge (AOC) No applicable interaction at this time. Sub-addressing (SUB) No impa

30、ct on ISUP. Terminal Portability (TP) No impact on ISUP. Completion of Calls to Busy Subscriber (CCBS) No applicable interaction at this time. Recommendation 4.733 CCITT RECMN*4-733 92 m 4862573 0573202 LTL m 1.6.20 Malicious Call Identification (MCID) No impact. 1.6.21 Reverse Charging (REV) No app

31、licable interaction at this time. Multi-Level Precedence and Pre-emption (MLPP) No impact on ISUP. 1.6.23 Private Numbering Plan (PNP) 1.6.22 No applicable interaction at this time. 1.6.24 Charge Card No applicable interaction at this time. 1.7 Interactions with other networks in the case of interwo

32、rking with networks which do not provide the Caii Waiting supplementary service, the interworking exchange wiil discard the notification indication. “he call will then be completed according to the basic cai1 procedure as described in Recommendation Q.764. 1 . Signalling flows User C Originating exc

33、hange SETUP -I _- ACM Address complete message ANM Answer message CW Call waiting IAM Initial address message) Tran& exchange Terminating exchange Subscriber B - -I - SETUP (no channel) -I _-_ IAM _- HGURE 1-114.733 Call Waiting succesfui Call Waiting indication in address complete message (ACM) T11

34、29310-91 Recommendation Q.733 5 CCITT RECMN*Q.733 92 m 48b2591 0573203 038 m Originating Transit Terminating Subs exchange exchange User C exchange T1129320-91 CPG Call progress message FIGURE 1-m.733 cawaithlgsucceapliil Ca Waiting indication in d progress message (CPC) 6 Ihr B User C Originating e

35、xchange Transit exchange Terminating exc inge - I- - SETUP - ALERTING (CW) _- - REL Release message RLC Release compiete message Recommendation Q.733 Subscriber B T1129330-91 FIGURE 1-3M.733 Ca Waiting rejection CCITT RECMN*Q-733 92 4862591 0573204 T74 Originating U! c exchange SENP I Transit exchan

36、ge I Terminating exchange REL (# 19) - I. RLC REL (# 19) - DISCONNECT (a19) i. REL Releasemessage RLC Release compiete message Subscriber B - -I T112MO-91 FIGURE 1-4m.733 Call WaiUngred 1.9 Parameter values (timers) No specific timers are required. 1.10 Dynamic description As a first step, the basic ca control SDLs (specification and description languages) of the ISDN User Part (ISUP) (see Recommendation 4.764) apply for the Call Waiting supplementary service, because there is no change in the message sequence. Recommendation Q.733 7