ITU-T Q 82 2-1993 Stage 2 Description for Call Offering Supplementary Services Clause 2 - Call Forwarding Clause 3 - Call Deflection - General Recommendations on Telephone SwitchinFlow.pdf

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1、- - ITU-T RECMN*Q*82 93 4862571 0588900 L5T INTERNATIONAL TELECOMMUNICATION UNION ITU=T TELECOMMUNICATION STANDARDIZATION SECTOR OF TU GENERAL RECOMMENDATIONS ON TELEPHONE SWITCHING AND SIGNALLING FUNCTIONS AND INFORMATION FLOWS FOR SERVICES IN THE ISDN Q.82 (03/93) STAGE 2 DESCRIPTION FOR CALL OFFE

2、RING SUPPLEMENTARY SERVICES CLAUSE 2 - CALL FORWARDING CLAUSE 3 - CALL DEFLECTION ITU-T Recommendation Q.82 (Previously “CCIlT Recommendation“) - ITU-T RECMN*Q-BZ 93 4862.593 0588902 09b = FOREWORD The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of the International Tel

3、ecom- munication Union. 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 every four year

4、s, established the topics for study by the ITU-T Study Groups which, in their turn, produce Recommendations on these topics. ITU-T Recommendation Q.82 was revised by the ITU-T Study Group XI (1988-1993) and was approved by the WTSC (Helsinki, March 1-12, 1993). NOTES 1 As a consequence of a reform p

5、rocess within the International Telecommunication Union (ITU), the CCITT ceased to exist as of 28 February 1993. In its place, the ITU Telecommunication Standardization Sector (ITU-T) was created as of 1 March 1993. Similarly, in this reform process, the CCIR and the IFRB have been replaced by the R

6、adiocommunication Sector. In order not to delay publication of this Recommendation, no change has been made in the text to references containing the acronyms ?CCITT, CCIR or IFRB? or their associated entities such as Plenary Assembly, Secretariat, etc. Future editions of this Recommendation will con

7、tain the proper terminology related to the new ITU structure. 2 telecommunication administration and a recognized operating agency. In this Recommendation, the expression ?Administration? is used for conciseness to indicate both a O ITU 1994 All rights reserved. No part of this publication may be re

8、produced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the ITLJ. ITU-T RECMNsQ.82 93 48b2591 0588902 T22 = CONTENTS 2 Call forwarding 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 2.10 scope References . Definitions

9、Symbols and abbreviations . Description Derivation of the functional model . Information flows . SDL diagrams for functional entities Functional entity actions . Allocation of functional entities to physical locations Annex A . Annex B . Activation. deactivation. registration and interrogation . 3 C

10、all deflection 3.1 Scope 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 References . Definitions Symbols and abbreviations . Description Derivation of the functional model . Information flow . SDL diagrams for functional entities Functional entity actions . Allocation of functional entities to physical locati

11、ons Annex A . Multiple diversion address handling Recommendation Q.82 (03/93) Page 1 1 2 2 3 3 4 4 19 37 39 40 42 51 51 52 52 53 53 53 55 65 81 83 84 ITU-T RECMN+Q.82 93 = 4862591 0588903 969 SUMMARY This Recommendation provides the Stage 2 description for the Call Forwarding supplementary services,

12、 supported by an ISDN. The Stage 2 descriptions are comprised of the switching functions and the signalling information flows. The Call Forwarding Unconditional supplementary service permits a served user to have the network send to another number all incoming calls for the served users number (or j

13、ust those associated with a specified basic service). The served users originating service is unaffected. If this service is activated, calls are forwarded no matter what the condition of the termination. The Call Forwarding on Busy supplementary service permits a served user to have the network sen

14、d to another number all incoming calls for the served users number (or just those associated with a specified basic service) which meet busy at the served users ISDN number. The served users originating service is unaffected. The Call Forwarding on No Reply supplementary service permits a served use

15、r to have the network send to another number ali incoming calls for the serviced users number (or just those associated with a specified basic service) which meet no reply at the served users ISDN number. The served users originating service is unaffected. This Recommendation provides the Stage 2 de

16、scription for the Call Deflection supplementary service, supported by an ISDN. The Stage 2 descriptions are comprised of the switching functions and the signalling information flows. The Call Deflection supplementary service permits a serviced user to, in real time, request that the network redirect

17、s an incoming call addressed to the served users ISDN number to another number. The served users originating service is unaffected. 11 Recommendation Q.82 (03/93) Recommendation Q.82 STAGE 2 DESCRIPTION FOR CALL OFFERING SUPPLEMENTARY SERVICES (Melbourne, 1988; modified at Helsinki, 1993) 2 Cali for

18、warding 2.1 Scope This Recommendation defines the Stage 2 for the Call Forwarding supplementary services (CFB, CFNR, CFU) of Integrated Services Digital Network (ISDN) as provided by public telecommunications operators. Stage 2 identifies the functional capabilities and the information flows needed

19、to support the service description. The Stage 2 description also identifies user operations not directly associated with a call (see Recommendation I. 130 i). This Recommendation is specified according to the methodology specified in Recommendation Q.65 2. This Recommendation does not formally descr

20、ibe the relationship between this supplementary service and the basic call, but where possible this information is included for guidance. In addition, this Recommendation does not specify the requirements where the service is provided to the user via a private ISDN. This Recommendation does not spec

21、ify the requirements for the allocation of defined functional entities within a private ISDN; it does however define which functional entities may be allocated to a private ISDN. This Recommendation does not specify the additional requirements where the service is provided to the user via a telecomm

22、unications network that is not an ISDN. This Recommendation describes the three versions of Call Forwarding supplementary services, when implemented using the “forward switching” network routing algorithm and partial rerouting at the public/private network interface as contained in Recommendation 4.

23、80 3. The description of full rerouting as described in Recommendation Q.80 is outside the scope of this Recommendation. The procedures for the activatioddeactivationkegistration of the forwarding services are contained in Annex B. The CFU supplementary service permits a served user to have the netw

24、ork send to another number all incoming calls for the served users number (or just those associated with a specified basic service). The served users originating service is unaffected. If this service is activated, calls are forwarded no matter the condition of the termination. The CFB supplementary

25、 service permits a served user to have the network send to another number all incoming calls for the served users number (or just those associated with a specified basic service) which meet busy at the served users ISDN number. The served users originating service is unaffected. The CFNR supplementa

26、ry service permits a served user to have the network send to another number all incoming calls for the served users number (or just those associated with a specified basic service) which meet no reply at the served users ISDN number. The served users originating service is unaffected. The forwarded-

27、to number is registered with the network for use on all calls. Recommendation Q.82 (03/93) 1 ITU-T RECMN*:Q*BC! 73 4862593 0588905 733 This Recommendation is applicable to the Stage 3 Recommendations for the ISDN Forwarding supplementary services CFB, CFNR and CFU. The term “Stage 3” is also defined

28、 in Recommendation 1.130 i. Where the text indicated the status of a requirement, i.e. as strict command or prohibition, as authorization leaving freedom, as a capability or possibility, this shall be reflected in the text of the relevant Stage 2 and Stage 3 Recommendations. Furthermore, conformance

29、 to this Recommendation is met by conforming to the Stage 3 Recommendations with the field of application appropriate to the equipment being implemented. Therefore no method of testing is provided for this Recommendation. 2.2 References This Recommendation incorporates by dated or undated reference,

30、 provisions from other publications. These references are cited at the appropriate places in this Recommendation and the publications are listed hereafter. For dated references, subsequent amendments to, or revisions of any of these publications apply to this Recommendation only when incorporated in

31、 it by amendment or revision. For undated references, the latest edition of the publication referred to applies. Ill CCITT Recommendation I. 130 Method for the characterization of telecommunication services supported an ISDN and netwcrk capabilities of an ISDN, 1988. Pl CCITT Recommendation Q.65 Sta

32、ge 2 of the method for the characterization of services supported by ISDN, 1988. 31 CCITT Recommendation Q.80 Introduction to stage 2 service descriptions for supplementary services, 1988. I41 CCITT Recommendation Q.71 ISDN 64 kbit/s circuit mode switched bearer service, 1992. PI CCITT Recommendatio

33、n 1.1 12 Vocabulary of terms for ISDNs, 1988. 61 I71 CCITT Recommendation E. 164 Numbering plan for the ISDN era, 1988. CCITT Recommendation 1.252.2 Call Forwarding Busy (CFB), 1992. I CCITT Recommendation 1.252.3 Call Forwarding No Reply (CFNR), 1992. 91 CCITT Recommendation 1.252.4 Call Forwarding

34、 Unconditional (CFU), 1992. 2.3 Definitions For the purposes of this Recommendation, the following definitions apply: Integrated Services Digital Network (ISDN): See 2.3D. 1 12 5, definition 308. Service - telecommunications service: See 2.2D.112 5, definition 201 ISDN number: A number conforming to

35、 the numbering plan and structure specified in Recommendation E.164 6. originally called number: The number of the B 1 -party. connected number: The number of the final destination (C-party). forwarding number: The number of the served user, i.e. the subscriber who initiates the forwarding service a

36、nd from where the call has been forwarded. forwarded-to number (FTN): The number to which a call has been forwarded. forwarding indicator (FI): Indicator showing that a call has been forwarded and indicating whether this information should be given to the calling party. forwarding indication: Indica

37、tion for the served user that forwarding has occurred. presentation indicator (PI): Indicator showing whether the FTN should be presented to the calling user, as derived from the C-partys COLR supplementary service. 2 Recommendation Q.82 (03/93) forwarding cause: Parameter which contains the reason

38、for the forwarding, e.g. CFU, CFB, CFNR, CD. network facility indicator (NFI): Indicator showing the preferred transit network or a network specific facility to be used for forwarding. 2.4 Symbols and abbreviations Abbreviations used: BC Basic Call cc Call Control CCA Call Control Agent CD Call Defl

39、ection CFB Cai1 Forwarding on Busy CFNR Call Forwarding No Reply CFFT Call Forwarding Profile Control CFU Cal Forwarding Unconditional FC Forwarding Cause FE Functional Entry FI Forwarding Indicator FTN Forwarded-to Number GD Global Data LE Local Exchange NDUB Network Determined User Busy NFI Networ

40、k Facility Indicator NSO Notification Subscription Option PI Presentation Indicator PN Frivate Network PNX Private Network Exchange SCE Service Control Entity SCM Service Control Model TE Terminal Equipment UDUB User Determined User Busy 2.5 Description The general description of the CFB supplementa

41、ry service is specified in 1.252.2 7. The general description of the CFNR supplementary service is specified in 1.252.3 8. The general description of the CFU supplementary service is specified in 1.252.4 9. Recommendation Q.82 (03/93) 3 ITU-T RECMN*Q=82 93 48b2591 0588907 50ir ra b rc d FE1 FE2 FE3

42、- FE4 2.6 Derivation of the functional model FE5 2.6.1 Functional model description The functional model for the CF supplementary service is shown in Figure 2- 1. NOTE - The addition of the functional model for the activatioddeactivatiodregistration of the forwarding services is contained in Figure

43、B.2-1. FIGURE 2-1/Q.82 Functional model 2.6.2 The functional entities required by the CF supplementary service in addition to those of the basic call are as follows: Description of the functional entities FE1 : Callers service agent FE2: Callers service control entity FE3: Call forwarding execution

44、entity FE%: FE5: Served users service agent FE6: Interface controlling entity FE7: FE8: Forwarded-to users service agent Call forwarding detection and control entity Forwarded-to users service control entity 2.6.3 The relationship with a basic service is shown in Figure 2-2. Relationship with a basi

45、c service NOTE - The relationship in Figure 2-3 covers scenarios 8 and 9 in 2.10. 2.7 Information flows 2.7.1 Information flows diagram The information flows for the Call Forwarding supplementary service are shown in Figures 2-4 to 2-12. 4 Recommendation Q.82 (03/93) ITU-T RECMN*Q.82 93 m 4862593 05

46、88908 440 m FE1 CCA rb rC rd - FE3 FE4 FE5 FE2 a rl 12 r2 r2 r3 i cc cc cc CCA FIGURE 2-214.82 Reiaticnship with a hic service r2 If r2 FE6 cc FE8 rD r3 cc CCA FE7 .i FE1 CCA FIGURE 2-314.82 - Ia rb d FE5 FE2 FE3 FE4 rl r2 r2 12 cc cc cc - Recommendation Q.82 (03/93) 5 I I I I I l I l I I ,“I I I I

47、I I I I I I I I Lm I I U ITU-T RECMN*Q-82 93 m 4862591 0588909 387 m I- w ZA V A h A A - I N ml I I L u C .- 6 Recommendation Q.82 (03/93) ITU-T RECMNJQ-82 93 M 4862593 0588910 OT9 M I ,- - -, req. ind. i44 REPORT 251 :- - - (alerting) req. ind. (Note 2) 961 FIGURE 2-1YQ.82 Flows across the publipnv

48、ate network interface at C-party NOTES related to the Figures 2-4 to 2-12: i 2 incaseof: The INFORM 5 shall be presented to FES not later than the associated SETUP req. ind. - COLR temporary mode activated at C; or - immediately responding terminal at C, the PI-value will be determined on receipt of

49、 SETUP resp. conf from FES. 3 The information flow ?INFORM 13? is optional; .e. only required with the option to restart the CFNR timer. 2.7.2 Relationship ra INFORM 2 (Notes 2 and 8) The contents of INFORM 2 ae shown in Table 2- 1. Definition of individual information flows TABLE 2-1/Q.82 14 Recommendation Q.82 (03/93) ITU-T RECMN*Q-BZ 93 q86259L 05889L8 39T Parameter Forwarded-to number INFORM 7 (Notes 3 and 8) The contents of INFORM 7 are shown in Table 2-2. Allowed value req.ind. - ISDN numb