1、INTERNATIONAL TELECOMMUNICATION UNION ITU-T TELECOMMUNICATION STAN DARD IZATION SECTOR OF ITU Q.735.6 SERIES Q: SWITCHING AND SIGNALLING Specifications of Signalling System No. 7 - ISDN supplementary services (07/96) Stage 3 description for community of interest supplementary services using Signalli
2、ng System No. 7: Global Virtual Network Service (GVNS) ITU-T Recommendation Q.735.6 (Previously CCIlT Recommendation) STDnITU-T RECMN Q-735-b-ENGL L97b E 4Bb2571 Ob33417 7417 ITU-T Q-SERIES RECOMMENDATIONS SWITCHING AND SIGNALLING SIGNALLING IN THE INTERNATIONAL MANUAL SERVICE INTERNATIONAL AUTOMATI
3、C AND SEMI-AUTOMATIC WORKING FUNCTIONS AND INFORMATION FLOWS FOR SERVICES IN THE ISDN SPECIFICATION OF SIGNALLING SYSTEMS No. 4 AND No. 5 SPECIFICATIONS OF SIGNALLING SYSTEM No. 6 SPECIFICATIONS OF SIGNALLING SYSTEM R1 SPECIFICATIONS OF SIGNALLING SYSTEM R2 DIGITAL EXCHANGES INTERWORKING OF SIGNALLI
4、NG SYSTEMS SPECIFICATIONS OF SIGNALLING SYSTEM No. 7 CLAUSES APPLICABLE TO ITU-T STANDARD SYSTEMS General Message transfer part , Signalling connection control part Q.1-Q.3 Q.4-Q.59 Q.6O-Q.99 Q.lOO-Q.119 Q. 120-Q.249 Q.250-Q.309 Q.31O-Q.399 Q.400-Q.499 Q.50O-Q.599 Q.60O-Q.699 Q.700-Q.849 Q.700 Q.701
5、-Q.709 (2.71 14.719 Telephone user part Q.72O-Q.729 Data user part Q.74O-Q.749 Signalling System No. 7 management ISDN user part Transaction capabilities application part Test specification Q3 interface DIGITAL SUBSCRIBER SIGNALLING SYSTEM No. 1 PUBLIC LAND MOBILE NETWORK INTERWORKING WITH SATELLITE
6、 MOBILE SYSTEMS INTELLIGENT NETWORK BROADBAND ISDN Q. 7504.759 Q.76O-Q.769 Q.77-Q.779 Q.78-Q.799 Q.800-Q.849 Q. 850-Q.999 Q.lOOO-Q.l O99 Q.1100-Q.1199 Q.1200-Q.1999 Q.2000-Q.2999 For further details, please refer to ITU-T List of Recommendations. ITU-T RECOMMENDATION 4.735.6 STAGE 3 DESCRIPTION FOR
7、COMMUNITY OF INTEREST SUPPLEMENTARY SERVICES USING SIGNALLING SYSTEM No. 7: GLOBAL VIRTUAL NETWORK SERVICE (GVNS) Summary The global virtual network service is a global switched service supported by multiple networks and is offered to customers over PSTN and/or ISDN. While minimizing the need for de
8、dicated network resources, GVNS provides private network functions to users at geographically dispersed international locations. Source ITU-T Recommendation Q.735.6 was prepared by ITU-T Study Group 11 (1993-1996) and was approved under the WTSC Resolution No. 1 procedure on the 9th of July 1996. -
9、STD-ITU-T RECMN Q.735.b-ENGL 197b m 4Bb2591 Ob33419 513 6 FOREWORD IT (International Telecommunication Union) is the United Nations Specialized Agency in the field of telecommunications. The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of the IT. The ITU-T is responsible
10、 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 years, establishes the topics for study by the IT-T
11、Study Groups which, in their turn, produce Recommendations on these topics. The approval of Recommendations by the Members of the IT-T is covered by the procedure laid down in WTSC Resolution No. 1. In some areas of information technology which fail within ITU-Ts purview, the necessary standards are
12、 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. INTELLECTUAL PROPERTY RIGHTS The ITU draws attention to the possibility tha
13、t 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, whether asserted by ITU members or others outside of the Recomme
14、ndation development process. As of the date of approval of this Recommendation, the ITU hadhad not received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, implementors are cautioned that this may not represent the latest inform
15、ation and are therefore strongly urged to consult the TSB patent database. O IT 1997 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the ITU.
16、 11 Recommendation 4.735.6 (07/96) . STD-ITU-T RECMN .735.b-ENGL L99b m 48b2591 Ob33420 235 = CONTENTS Page 6 Global virtual network service . 6.1 Introduction 6.1.1 Scope . 6.1.2 References . 6.1.3 Terms and definitions 6.1 -4 Abbreviations 6.2 Description . 6.2.1 General descnpon 6.2.2 Specific te
17、rminology . 6.2.3 Qualification on the applicability to telecommunication services 6.2.4 State definitions . 6.3 Operational requirements . 6.3.1 Provision and withdrawal 6.3.2 Requirements on the originating network side 6.3.3 Requirements in the network . 6.3.4 Requirements on the terminating netw
18、ork side . 6.4 Coding requirements 6.4.2 Parameters . 6.5 Signalling procedures . 6.5.1 Activatioddeactivatiodregistration 6.5.2 Invocation and operation . 6.4.1 Messages . 6.6 Interactions with other supplementary services 6.6.2 Call transfer services . 6.6.3 Connected line identification presentat
19、ion (COLP) 6.6.4 Connected line identification restriction (COLR) . 6.6.5 Calling Line Identification Presentation (CLIP) . 6.6.6 Calling Line Identification Restriction (CLIR) . 6.6.7 Closed User Group (CUG) 6.6.9 Direct-Dialing-In (DDI) 6.6.10 Call diversion services (CDIV) . 6.6.1 1 6.6.1 Call Wa
20、iting (CW) 6.6.8 Conference calling (CONF) Line Hunting (LH) 6.6.12 Three-Party service (3PTY) 6.6.13 User-to-User Signalling (UUS) . 6.6.14 Multiple Subscriber Number (MSN) . Recommendation 4.735.6 (07196) 1 2 2 3 3 3 3 3 3 3 3 3 3 3 7 7 8 15 15 15 15 15 15 15 15 16 16 16 16 16 16 16 . 111 STD-ITU-
21、T RECMN Q.735.b-ENGL 199b m 4b2.571 Ob33421 171 D 6.6.15 Call hold (HOLD) . Advice of Charge (AOC) 6.6.17 Sub-addressing (SUB) . 6.6.18 Terminal Portability (TP) Completion of Calls to Busy Subscriber (CCBS) . Malicious Call Identification (MCID) . Reverse charging (REV) . Private Numbering Plan (PN
22、P) . 6.6.16 6.6.19 6.6.20 6.6.2 1 6.6.22 Multi-Level Precedence and Preemption (MLPP) 6.6.23 6.6.24 International Telecommunication Charge Card (ITCC) . Interaction with other networks 6.7 6.8 Signalling flows 6.9 Parameter values (timers) . 6.1 O Dynamic descnption . Page 16 16 16 17 17 17 17 17 17
23、 17 17 17 17 17 iv Recommendation 4.735.6 (07/96) STD-ITU-T RECMN Q-735-b-ENGL L77b S 48b259L Ob33422 O08 S Recommendation Q.735.6 STAGE 3 DESCRIPTION FOR COMMUNITY OF INTEREST SUPPLEMENTARY SERVICES USING SIGNALLING SYSTEM No. 7: GLOBAL VIRTUAL NETWORK SERVICE (GVNS) (Geneva, 1996) 6 Global virtual
24、 network service 6.1 Introduction 6.1.1 Scope The Global Virtual Network Service (GVNS) is a multi-network international service which provides private network functions to users at geographically dispersed international locations while minimizing the need for dedicated network resources. It may be
25、offered to customers over the PSTN or ISDN. 6.1.2 References The following ITU-T Recommendations, and other references contain provisions which, through reference in this text, constitute provisions of this Recommendation. At the time of publication, the editions indicated were valid. All Recommenda
26、tions 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 Recommendations and other references listed below. A list of the currently valid ITU-T Recommendations is regularly
27、published. 11 CCITT Recommendation I. 130 (1988), Method for the characterization of 2 3 4 5 6 7 8 6.1.3 Terms and definitions This Recommendation defines the following terms. 6.1.3.1 dialled number: The number which a GVNS user dialled excluding prefix digits. NOTE - This information, if required b
28、y the terminating network, will be included in the terminating network routing number. telecommunication services supported by an ISDN and network capabilities of an ISDN. ITU-T Recommendation 1.1 12 (1993), Vocabulary of terms for ISDNs. ITU-T Recommendation 4.71 (1993), ISDN circuit mode switched
29、bearer services. ITU-T Recommendation F. 16 (1 999, Global virtual network service. ITU-T Recommendation 4.85.6 (1996), Stage 2 description for community of interest supplementary services: Global Virtual Network Service (GWS). CCITT Recommendation E. 164 (1 991), Numberingplan for the ISDN era. ITU
30、-T Recommendation 4.763 (1993), Formats and codes of the ISDN User Part of Signalling System No. 7. ITU-T Recommendation 4.730 (1 993), ISDN supplementary services. Recommendation Q.735.6 (07196) 1 STD-ITU-T RECMN Q.735.b-ENGL 177b 48b2571 b33423 Tq4 W 6.1.3.2 ISDN number: A number conforming to the
31、 numbering plan and the structure specified in Recommendation E. 164 6. 6.1.3.3 terminating access indication: Information used to identify the type of access that the GVNS terminating participating service provider actually used to complete the call. 6.1.3.4 GVNS user group identification: Informat
32、ion that uniquely identifies the GVNS customer. An example for the usage of such information is to locate the address of the database record of a GVNS customer. 6.1.3.5 originating participating service provider identification: Information that Uniquely identifies the participating service provider
33、that provides customer access to GVNS to the calling userhnterface. 6.1.3.6 routing number: Information used to complete a call to the termhating functional entity. This information is mandatory and is carried by an ISDN number (fully conforming to Recommendation E. 164). NOTE - Whenever adjacent GV
34、NS functional entities are implemented by separate GVNS Participating Service Providers, the Routing Number shall be an ISDN number (fully conforming to Recommendation E. 164) unless another prior arrangement exists between the participating service providers. 6.1.3.7 terminating network routing num
35、ber: Information used by the terminating functional entity to route calls. This information is mandatory and is carried by either an ISDN number (fully conforming to Recommendation E. 164) or a network-specific number. 6.1.3.8 terminating participating service provider identification: Information th
36、at uniquely identifies the participating service provider that provides customer access to GVNS to the called userhnterface. NOTE - This information is included in the Routing Number. 6.1.4 Abbreviations This Recommendation uses the following abbreviations. ISDN Integrated Services Digital Network N
37、DC National Destination Code OPSP Originating Participating Service Provider Identification PSTN Public Switched Telephone Network TPSP Terminating Participating Service Provider Identification 6.2 Description This clause is specific to Signalling System No. 7 protocol for the ISDN User Part. Stage
38、3 identifies the protocol procedures and switching functions needed to support a telecommunication service. This clause is limited to the type A and B call mechanisms as defined by the GVNS Stage 2 5. It does not fully support the type C call mechanism. 6.2.1 General description GVNS allows service
39、providers to offer subscribing customers a service with the features and functionality similar to that of a private network while minimizing the need for dedicated network resources; however, dedicated network resources may be used to access GVNS or in conjunction with GVNS. A GVNS customer is assig
40、ned a unique identifier which identifies the GVNS user group. GVNS user group identification provides a means by which various networks can recognize 2 Recommendation 4.735.6 (07/96) STDmITU-T RECMN Q.735-b-ENGL 199b I 48b2.591 Ub33424 980 the customer. A GVNS customer may choose to group users into
41、 one or more subgroups in order to allow subgroup dependent service interactions and operations. The Stage 1 ITU-T definitions for the GVNS service are given in Recommendation F. 16. The Stage 2 ITU-T descriptions are given in Recommendation Q.85.6. The Stage 3 description of GVNS service uses the I
42、SDN user part protocol as defined in Recommendations 4.76 1-764. 6.2.2 Specific terminology See 6.1.3 terms and definitions. 6.2.3 This service is applicable to circuit mode bearer services in the ISDN. Qualification on the applicability to telecommunication services 6.2.4 State definitions No speci
43、fic state definitions are required. 6.3 Operational requirements 6.3.1 Provision and withdrawal The GVNS is provided to the customer by subscription. Provision and coordination of GVNS may be required in multiple networks depending on the location of the customers users. 6.3.2 Not applicable. Requir
44、ements on the originating network side 6.3.3 Requirements in the network No specific requirements. 6.3.4 Not applicable. Requirements on the terminating network side 6.4 Coding requirements 6.4.1 Messages The forward GVNS parameter is an optional part in the initial address message. For the GVNS ser
45、vice, in addition to the messages and parameters defined in the Recommendation 4.763, the initial address message always includes a forward GVNS parameter in order to convey GVNS-specific information between the participating Administrations. Its use is mandatory when the call is a GVNS call. For th
46、e GVNS service, in addition to the messages and parameters defined in Recommendation 4.763, the answer and connect messages in the backward direction shall contain a backward GVNS parameter. The forward GVNS parameter is described in 6.4.2.1 and its format is shown in Figure 6-1. The backward GVNS p
47、arameter is described in 6.4.2.2 and its format is shown in Figure 6-5. 6.4.2 Parameters 6.4.2.1 Forward GVNS parameter The format of the forward GVNS parameter is given in Figure 6- 1. Recommendation 4.735.6 (07196) 3 STD-ITU-T RECMN Q-735.b-ENGL 199b M 48b2591 Ob33425 817 m 2nd digit . Filler (if
48、necessary) a) 1 la . In 1st digit . nh digit 8 7 6 5 4 3 2 1 Originating participating service provider OPSP GVNS user group GUG Terminating network routing number T“ Figure 6-UQ.735.6 - Forward GVNS parameter field The following codes are used in the subfields of the forward GVNS parameter: Origina
49、ting participating service provider See Figure 6-2. 8 7 6 5 4 3 2 I I I OPSP length indicator OE Spare Figure 6-2/Q.735.6 - Originating participating service provider subfield 1) Oddeven indicator (O/E) O even number of digits 1 odd number of digits Number of octets to follow. The maximum number of octets is 4 allowing for a maximum number of digits to 7. Digit string in BCD encoding of flexible length representing the originating participating service provider identification (OPSP). In case of an odd number of address signals, the filler code O000 i
