ITU-T H 450 3-1998 Call Diversion Supplementary Service for H 323 - Series H Audiovisual and Multimedia Systems - Supplementary Service for Multimedia (Study Group 16 70 pp)《H 323呼.pdf

1、- STD-ITU-T RECMN H.450-3-ENGL 3998 m 4862593 0649434 371 m INTERNATIONAL TELECOMMUNICATION UNION ITUmT TELECOMMUNICATION STAN DARD IZATIO N SECT0 R OF ITU H.450.3 (02/98) SERIES H: AUDIOVISUAL AND MULTIMEDIA SYSTEMS Supplementary service for multimedia Call diversion supplementary service for H.323

2、 ITU-T Recommendation H.450.3 (Previously CCITT Recommendation) STD=ITU-T RECMN H.450-3-ENGL 1998 M 4862591 Ob49435 008 ITU-T H-SERIES RECOMMENDATIONS AUDIOVISUAL AND MULTIMEDIA SYSTEMS Characteristics of transmission channels used for other than telephone purposes H. 1 O-H. 1 9 Use of telephone-typ

3、e circuits for voice-frequency telegraphy Telephone circuits or cables used for various types of telegraph transmission or simultaneous transmission H.20-H.29 H. 30-H. 39 Telephone-type circuits used for facsimile telegraphy H.40-H.49 H.50-H.99 EMS H. 1 OO-H. I 99 Characteristics of data signals CHA

4、RACTERISTICS OF VISUAL TELEPHONE SYS INFRASTRUCTURE OF AUDIOVISUAL SERVICES General Transmission multiplexing and synchronization Systems aspects Communication procedures Coding of moving video Related systems aspects H .200-H. 2 1 9 H.220-H.229 H.230-H.239 H .240-H .259 H .260-H ,279 H .280-H. 299

5、Systems and terminal equipment for audiovisual services H.300-H.399 Supplementary service for multimedia H.4504.499 For further details, please refer to ITU-T List of Recommendations. STD-ITU-T RECMN H.450.3-ENGL L778 m 48b257L Ob47436 T44 m ITU-T RECOMMENDATION H.450.3 CALL DIVERSION SUPPLEMENTARY

6、SERVICE FOR H.323 Summary This Recommendation describes the procedures and the signalling protocol for the Call diversion supplementary service (SS-DIV) in H.323 (Packet based multimedia communications systems) networks. This Recommendation comprises the services Call Forwarding Unconditional (SS-CF

7、U), Call Forwarding Busy (SS-CFB), Call Forwarding No Reply (SS-CFNR) and Call Deflection SS-CFU, SS-CFB, SS-CFNR and SS-CD are supplementary services which apply during call establishment providing a diversion of an incoming call to another destination endpoint. This Recommendation makes use of the

8、 “Generic functional protocol for the support of supplementary services in H.323“ as defined in Recommendation H.450.1 The procedures and the signalling protocol of this Recommendation are derived from the Call diversion supplementary service specified in ISOAEC 13872 and ISOAEC 13 873. (SS-CD). Sou

9、rce ITU-T Recommendation H.450.3 was prepared by ITU-T Study Group 16 (1997-2000) and was approved under the WTSC Resolution No. 1 procedure on the 6th February 1998. FOREWORD ITU (International Telecommunication Union) is the United Nations Specialized Agency in the field of telecommunications. The

10、 IT Telecommunication Standardization Sector (IT-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 S

11、tandardization Conference (WTSC), which meets 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 Resoluti

12、on No. 1. In some areas of information technology 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

13、 and a recognized operating agency. INTELLECTUAL 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 applicab

14、ility of claimed Intellectual Property Rights, whether asserted by IT members or others outside of the Recommendation development process. As of the date of approval of this Recommendation, the IT had not received notice of intellectual property, protected by patents, which may be required to implem

15、ent this Recommendation. However, implementors are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent database. O ITU 1998 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means,

16、electronic or mechanical, including photocopying and microfilm, without permission in writing from the ITU. Recommendation H.450.3 (02/98) 11 1 2 3 4 5 5.1 5.2 5.3 6 6.1 6.2 6.3 7 7.1 7.2 7.3 8 8.1 8.2 8.3 9 9.1 9.2 CONTENTS Scope References Terms and definitions . Abbreviations and acronyms SS-CFU

17、service description . Description . ActivatiodDeactivatiodInterrogationRegistration . 5.2.1 Local activatioddeactivation 5.2.2 Remote activatioddeactivation . 5.2.3 Local interrogation Invocation and operation 5.2.4 Remote interrogation . 5.3.1 Served user notification . 5.3.2 Diverted-to user notif

18、ication . 5.3.3 Calling user notification . i SS-CFB service description Description . Invocation and operation SS-CFNR service descnption . Description . Activation/Deactivation/Interrogation/Registration . Invocation and operation ActivationDeactivatiodInterrogatiodRegistration . SS-CD service des

19、cription Description . ActivatiordDeactivationRegistrationInterrogation . Invocation and operation .i. . Messages. information elements. operations and procedures . Actions at the Originating endpoint . Actions at a gatekeeper . 9.2.1 Partial rerouting . 9.2.2 ActivatiodDeactivatiodInterrogationNeri

20、fication of diverted-to number 9.2.3 Invocation Recommendation H.450.3 (02/98) Page 1 1 2 3 4 4 4 4 4 5 5 5 5 6 6 7 7 7 7 7 7 7 7 8 8 8 8 8 9 9 10 10 10 . 111 STD-ITU-T RECMN H.450.3-ENGL 1998 4862593 Ob49439 753 9.3 9.4 9.5 9.6 9.7 9.8 9.9 10 10.1 10.2 10.3 10.4 Actions at the Served endpoint . 9.3

21、.1 Activation 9.3.2 Deactivation 9.3.3 Interrogation 9.3.4 Verification of the diverted-to endpoints number 9.3.5 Invocation Actions at the Rerouting endpoint Actions at the Diverted-to endpoint . 9.5.1 Invocation 9.5.2 Verification of the Diverted-to endpoints number . Actions at the Activating end

22、point . Actions at the Deactivating endpoint . Actions at the Interrogating endpoint . Interactions . 9.9.1 Interactions with gatekeeper routed model . 9.9.2 Interaction with other supplementary services Dynamic description of Call Diversion . Operational models and signalling flows . Communication

23、between CDO (Originating) signalling entity and CDO signalling entity user . 10.2.1 Table of primitives 1 0.2.2 Primitive definition . 10.2.3 Parameters . 10.2.4 States . Communication between CDS (Served) signalling entity and CDS signalling entity 1 0.3.1 1 0.3.2 Primitive definition . 10.3.3 Para

24、meters . 10.3.4 States . Communication between CDF (Diverted-to) signalling entity and CDF signalling entity user . 10.4.1 Table of primitives 10.4.2 Primitive definition . 1 0.4.3 Parameters . 10.4.4 States . user . Table of primitives Page 11 11 11 12 12 12 13 15 15 16 16 16 16 17 17 17 17 17 24 2

25、4 24 25 25 25 25 26 26 28 29 29 29 29 30 iv Recommendation H.450.3 (02/98) 10.5 10.6 10.7 10.8 10.9 11 12 12.1 12.2 12.3 12.4 12.5 Communication between CDR (Rerouting) signalling entity and CDR signalling entity user . 1 0.5,l 10.5.2 Primitive definition . 1 0.5.3 Parameters . 10.5.4 States . Commu

26、nication between CDA (Activating) signalling entity and CDA signalling entity user . 10.6.1 Table of primitives 10.6.2 Primitive definition . 10.6.3 Parameters . 10.6.4 States . Communication between CDD (Deactivating) signalling entity and CDD signalling entity user . 10.7.1 Table of primitives 1 0

27、.7.2 Primitive definition . 1 0.7.3 Parameters . 10.7.4 States Communication between CDI (Interrogating) signalling entity and CDI signalling entity user . 10.8.1 Table of primitives 10.8.2 Primitive definition . 10.8.3 Parameters . 10.8.4 States . Peer-to-Peer communication for call diversion Table

28、 of primitives 10.9.1 10.9.2 10.9.3 10.9.4 10.9.5 10.9.6 Messages . Timers Counters Message flows: Remote activation of call diversion . Message flow: Call Forwarding “immediate“ with rerouting . Message flow: Call Forwarding “delayed“ with rerouting Operations in support of Call diversion supplemen

29、tary service . Specification and Description Language (SDL) diagrams . Call Diversion block diagram . Call Diversion substructure diagram Call Diversion Activating Endpoint (CDA) SDLs . Call Diversion Deactivating Endpoint (CDD) SDLs . Call Diversion Interrogating (CDI) SDLs Recommendation H.450.3 (

30、02/98) Page 30 30 30 30 30 31 31 31 31 31 31 31 31 32 32 32 32 32 32 32 32 32 33 33 33 33 34 39 44 44 45 48 49 50 V STD-ITU-T RECHN H.450-3-ENGL 1998 m 4862591 Ob49441 301 m Page 12.6 Call Diversion Originating Endpoint (CDO) SDLs . 51 12.7 Call Diversion Rerouting Endpoint (CDR) SDLs 53 12.8 Call D

31、iversion Served Endpoint (CDS) SDLs . 55 12.9 Call Diversion Diverted-to endpoint (CDF) SDLs . 59 vi Recommendation H.450.3 (02/98) Recommendation H.450.3 CALL DIVERSION SUPPLEMENTARY SERVICES FOR H.323 (Geneva, 1998) 1 Scope This Recommendation specifies the diversion supplementary services (SS-DIV

32、), which comprise the services Call Forwarding Unconditional (SS-CFU), Call Forwarding Busy (SS-CFB), Call Forwarding No Reply (SS-CFNR) and Call Deflection (SS-CD), all of which are applicable to various basic services supported by H.323 endpoints. NOTE - The concept of basic services in the contex

33、t of H.323 is for further study. SS-CFU, SS-CFB, SS-CFNR and SS-CD are supplementary services which apply during call establishment providing a diversion of an incoming call to another destination endpoint. SS-CFU, SS-CFB , SS-CFNR and SS-CD are supplementary services which apply to point-to-point c

34、alls. An incoming call via multicasting may be subject to call diversion. This Call diversion supplementary service is based on ISO/IEC 13872 and ISO/IEC 13 873. 2 References The following ITU-T Recommendations and other references contain provisions which, through reference in this text, constitute

35、 provisions of the 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 Reco

36、mmendations and other references listed below. A list of the currently valid ITU-T Recommendations is regularly published. ITU-T Recommendation H.225.0 (1 998), Call signalling protocols and media stream packetization for packet based multimedia communication systems. ITU-T Recommendation H.245 (1 9

37、98), Control protocol for multimedia communication. ITU-T Recommendation H.323 (1 998), Packet based multimedia communications systems. ITU-T Recommendation H.450.1 (1998), Generic functional protocol for the support of supplementary services in H. 323. ITU-T Recommendation 1.1 12 (1993), Vocabulary

38、 of terms for ISDNs. ITU-T Recommendation 1.2 1 O (1 993), Principles of telecommunication services supported by an ISDN and the means to describe them. ISO/IEC 13 872: 1995, Information technology - Telecommunications and information exchange between systems - Private Integrated Services Network -

39、Specification, finctional and information flows - Call diversion supplementary services. ISOIEC 13873 ; 1995, Information technology - Telecommunications and information exchange between systems - Private Integrated Services Network - Inter-exchange signalling protocol - Call diversion supplementary

40、 services. Recommendation H.450.3 (02/98) 1 3 Terms and definitions This Recommendation defines the following terms: 3.1 activating call: Signalling connection between an activating user and a served endpoint. 3.2 activating endpoint: The endpoint serving the activating user. 3.3 call deflection: Th

41、e type of diversion invoked by the served user. 3.4 CheckRestriction call: Signalling connection between a served endpoint and a diverted-to endpoint, for the aim of checking call diversion restrictions. 3.5 deactivating call: Signalling connection between a deactivating user and the served endpoint

42、. 3.6 deactivating endpoint: The endpoint serving the deactivating user. 3.7 diversion: The redirection of a call, on request of a called (=served) endpoint or user and prior to answer, to a number different from the number of that called endpointher. 3.8 diverted-to number: The number to which a ca

43、ll is diverted. 3.9 diverted-to subaddress: The subaddress to which a call is diverted. 3.10 diverted-to endpoint: The endpoint to which a call is diverted. 3.11 diverting cause: The parameter which contains the reason for the diversion, e.g. CFU, CFB, CFNR. 3.12 diverting number: The number of the

44、served endpointluser. 3.13 endpoint: See Recommendation H.323. 3.14 endpoint A: The calling endpoint of a call which is subject to call diversion. 3.15 endpoint B: The served (diverting) endpoint of a call which is subject to call diversion. 3.16 endpoint B1, endpoint B2, endpoint B3, etc.: Served (

45、diverting) endpoints of a call which is subject to multiple stages of diversion. B1 is the first served endpoint, B2 is the second served endpoint, B3 is the third served endpoint, etc. 3.17 endpoint C: The diverted-to endpoint with respect to the final stage of call diversion. 3.18 forwarded call:

46、Call leg from a rerouting entity towards the diverted-to user. 3.19 forwarding: The type of diversion invoked automatically by the served endpoint in accordance with information previously registered in the served endpoint against the called number. 3.20 forwarding call: Call leg between a rerouting

47、 entity and a served endpoinuuser. 3.21 interrogating call: Signalling connection between an interrogating user and the served endpoint. 3.22 interrogating endpoint: The endpoint serving the interrogating user. 3.23 last diverting endpoint: The served endpoint from the point of view of the diverted-

48、to endpoint for a particular stage of call diversion. In the case of a call subject to a single stage of call diversion, endpoint B is the last diverting endpoint from the point of view of endpoint C. In the case of a call subject to multiple stages of call diversion, endpoint B1 is the last diverti

49、ng endpoint from the point of view of endpoint B2, endpoint B2 is the last diverting endpoint from the point of view of endpoint B3, etc. The served endpoint for the final stage of call diversion is the last diverting endpoint fiom the point of view of endpoint C. 3.24 original called number: In case of multiple call diversion, the number of endpoint B1. 2 Recommendation H.450.3 (02/98) STD.ITU-T RECMN H.450.3-ENGL 1998 m 48b2591 Ob49444 O10 = 3.25 original call