1、INTERNATIONAL TELECOMMUNICATION UNION ITU=T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU 1.255.2 (07/96) SERIES I: INTEGRATED SERVICES DIGITAL NETWORK Service capabilities - Supplementary services in ISDN Community of interest supplementary services: Support of Private Numbering Plans ITU-T Recom
2、mendation I .255.2 (Previously “CCITT Recommendation”) ITU-T I-SERIES RECOMMENDATIONS INTEGRATED SERVICES DIGITAL NETWORK 3ENERAL STRUCTURE Terminology Description of ISDNs General modelling methods Telecommunication network and service attributes General description of asynchronous transfer mode Sc
3、ope General aspects of services in ISDN Common aspects of services in the ISDN Bearer services supported by an ISDN Teleservices supported by an ISDN Supplementary services in ISDN Network functional principles Reference models Numbering, addressing and routing Connection types Performance objective
4、s Protocol layer requirements General network requirements and functions Application of I-series Recommendations to ISDN user-network interfaces Layer 1 Recommendations Layer 2 Recommendations Layer 3 Recommendations Multiplexing, rate adaption and support of existing interfaces Aspects of ISDN affe
5、cting terminal requirements SE CAPABILITIES OVERALL NETWORK ASPECTS AND FUNCTIONS ISDN USER-NETWORK INTERFACES INTERNETWORK INTERFACES MAINTENANCE PRINCIPLES B-ISDN EQUIPMENT ASPECTS ATM equipment Management of ATM equipment I. 100-1.199 1.110-1.119 I. 120-1.129 1.130-1.139 I. 140-1.149 1.150-1.199
6、1.2 10-1.2 19 1.220-1.229 1.230-1.239 1.240-1.249 1.250-1.299 1.300-1.399 1.3 10-1.3 19 1.320-1.329 1.330-1.339 1.340-1.349 1.350-1.359 1.360-1.369 1.370-1.399 1.400-1.499 1.420-1.429 1.430-1.439 1.440-1.449 1.450-1.459 1.460-1.469 1.470-1.499 1.500-1.599 1.600-1.699 1.700-1.799 1.730-1.749 1.750-1.
7、799 For further details, please refer to ITU-T List of Recommendations. FOREWORD The ITU-T (Telecommunication Standardization Sector) is a permanent organ of the International Telecommunication Union (IT). The IT-T is responsible for studying technical, operating and tariff questions and issuing Rec
8、ommen- dations 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 ITU-T Study Groups which, in their turn, produce Recommendations on these
9、topics. The approval of Recommendations by the Members of the IT-T is covered by the procedure laid down in WTSC Resolution No. 1 (Helsinki, March 1-12, 1993). ITU-T Recommendation 1.255.2 was revised by ITU-T Study Group 1 (1993-1996) and was approved under the WTSC Resolution No. 1 procedure on th
10、e 19th of July 1996. NOTE In this Recommendation, the expression “Administration” is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. O ITU 1996 All rights reserved. No part of this publication may be reproduced or utilized in any form or by
11、 any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the ITU. Recommendation 1.255.2 (07/96) i STD-ITU-T RECMN 1.255-2-ENGL L77b W 48b257L Ub2LLiLL 54T 1 2 3 4 5 6 7 CONTENTS Definition . Description . 2 .i General description . 2.2 Specific
12、terminology . 2.3 Qualifications on the applicability to telecommunication services . Procedures 3.1 Provision/withdrawal 3.2 Normal procedures 3.3 Exceptional procedures . 3.4 Alternative procedures Network capabilities for charging Interworking requirements . Interworking with private ISDNs . Inte
13、raction with other supplementary services . 5.1 Interworking with non-ISDNs 5.2 5.3 Interworking with public ISDNs 6.1 6.2 6.3 6.4 6.5 6.6 6.7 6.8 6.9 6.10 6.1 1 6.12 6.13 6.14 6.15 6.16 6.17 6.18 6.19 Call Waiting Call Transfer . Connected Line Identification Presentation Connected Line Identificat
14、ion Restriction Calling Line Identification Presentation . Calling Line Identification Restriction . Closed User Group . Conference Calling Direct-Dialling-In . Call Diversion . Line Hunting . User-To-User Signalling . Call Hold . Advice of Charge Multi-Level Precedence and preemption Priority . Thr
15、ee-Party Service . Multiple Subscriber Number Page 1 i 1 2 2 2 2 3 3 3 3 3 3 3 4 4 4 4 4 4 4 5 5 5 5 5 6 6 6 6 6 6 7 7 Support of Private Numbering Plan 7 Dynamic description 7 11 Recommendation 1.255.2 (07/96) - Recommendation 1.255.2 COMMUNITY OF INTEREST SUPPLEMENTARY SERVICES: SUPPORT OF PRIVATE
16、 NUMBERING PLANS (revised in 1996) 1 Definition This supplementary service allows a subscriber to use a Private Numbering Plan (PNP) for communication across one or more networks between nominated user access interfaces. The SPNP supplementary service provides a group of users with the capability to
17、 place calls by using digit sequences having different structures and meanings than provided by the public numbering plan. 2 Description 2.1 General description Application of this service will allow a subscriber to use a PNP to establish calls between nominated user access interfaces whilst using t
18、he resources of one or more networks. For example, a business having multiple offices could have a numbering plan which would appear the same to all users regardless of their geographical location. A business can also assign Private Numbers (PNs) to locations outside the business (e.g. business cust
19、omers, suppliers) and allow the businesss users to reach these locations via the assigned PNs that are part of the business private numbering plan. (The locations outside the business in this example are not considered Members of a PNP Group.) The PNP could be used to assign numbers to accesses conn
20、ected to the public network via an NT1 or via an NT2, such as an Integrated Services PBX. An access is assigned one private number, unless the user subscribes to other supplementary services (e.g. MSN, DDI). The SPNP supplementary service may provide the user with the capability, from a terminal, to
21、 assign or de-assign private numbers to the group. The SPNP supplementary service can be used as a building block for service concepts such as city-wide centrex and virtual private networks. A PNP can be used instead of the ISDN numbering plan on a call by call basis or be nominated by the Subscribe
22、r as the sole numbering plan available for calls at a user access interface. A user may belong to more than one PNP. Members of a PNP Group can make and receive PNP calls within the PNP Group. Virtual Members of a PNP Group can only receive, but cannot make, PNP calls within the PNP Group. The handl
23、ing of calls from a Virtual Member of a PNP Group is outside the scope of this Recommendation. Such calls will be handled as normal ISDN calls. A Virtual Member of a particular PNP Group will have the same PNP Group Identification (PNG) as the Members of that PNP Group. A Member of a PNP Group can m
24、ake PNP calls to Virtual Members of the same PNP Group. A Member of a PNP Group may also make calls to public numbers. The inclusion of one or more Virtual Members per PNP Group is a subscription option. The SPNP supplementary service allows the address digits and sequences of digits sent by users i
25、n this PNP Group to have a different structure and significance than the same digit sequence when sent by users outside the PNP Group. Particular digits or digit sequences may signify a request to escape from the PNP and access users using the ISDN numbering plan. As an alternative, an explicit indi
26、cation of the numbering plan may be given. Recommendation 1.255.2 (07/96) 1 STD-ITU-T RECMN 1.255.2-ENGL L77b YBb259L ObZLqL3 312 W Subscription options Members of the PNP Group may have both private numbers and ISDN numbers. This permits users outside the PNPGroup to call PNP Group users with norma
27、l calling procedures (e.g. without assistance of an attendant). In some cases, the private numbers may consist of the least significant digits of the ISDN numbers, where these digits are sufficient to uniquely identify the PNP Group Member. Value 2.2 Specific terminology 2.2.1 meanings than provided
28、 by the public numbering plan. 2.2.2 numbers) in the same PNP in order to make and receive PNP calls. 2.2.3 Member of the same PNP Group by the means of the PNP. 2.2.4 virtual member of a PNP group: A Virtual Member of a PNP Group is a user who can be identified by a number in a private numbering pl
29、an, i.e. the user can receive calls from Members of that PNP Group, but cannot originate calls using that private numbering plan. 2.2.5 to distinguish between PNP Groups. private number plan (PNP): A subscriber defined numbering plan which may have different structures and PNP group: A PNP Group con
30、sists of the set of users who are each allocated a number (or possibly several PNP call: A PNP call is a call which is made by a Member of a PNP Group to another Member or Virtual PNP group identification (PNG): A PNP group identification (PNG) is a piece of information which is used Subscription op
31、tions 2.3 No restrictions identified. Qualifications on the applicability to telecommunication services Value 3 Procedures Virtual members allowed 3.1 ProvisionJwithdrawai Yes No The SPNP supplementary service is subscribed by prior arrangement with the service provider. The PNP used is established
32、by agreement between the subscriber and the service provider. At provision, numbers belonging to a user-defined numbering are accesses or groups of accesses belonging to the PNP Group( s). Withdrawal of the SPNP supplementary service is made by the service provider upon request by the Subscriber or
33、for service provider reasons. Withdrawal implies erasure of all PNP numbers allocated to the accesses or group of accesses belonging to the PNP Group(s). Member of Multiple PNP Groups I Yes, with PNGs No Subscription options subscribed per PNP Group (see 2.1) I PNP as a sole numbering plan I Yes No
34、As a service provider option, a Member of a PNP, who belongs to more than one PNP Group, may be given the option to designate one of the PNP Groups as the default PNP Group. 3.2 Normal procedures 3.2.1 Activation/deactivation/registration The SPNP supplementary service is activated at provision and
35、deactivated at withdrawal, under the control of the service provider. Registration is done at provision and erasure is done at withdrawal. 3.2.2 Invocation and operation When originating a PNP call, if the calling user belongs to more than one PNP Group, the PNG must be indicated when identifying th
36、e called user. If no information identifying the PNP Group associated to the call is supplied by the calling user, then the call shall be rejected, unless the service provider offers the possibility of a default PNP Group, and one has been designated. (See 3.1.) When originating a PNP call, if the c
37、alling user belongs to only one PNP Group, a PNG is not required. The called user shall be informed that the call is a PNP call. If the called user belongs to more than one PNP Group, then the called user shall be informed of the PNP Group to which the call belongs. 3.3 Exceptional procedures 3.3.1
38、Activation/deactivation/registration 3.3.2 Invocation and operation For unsuccessful outcome due to incorrect use of the PNP, for example, use of a number which does not have a defined network location, the calling party shall be given an indication which may be accompanied by an in-band tone or ann
39、ouncement. 3.4 Alternative procedures None identified. 4 Network capabilities for charging This Recommendation does not cover charging principles. Future Recommendations in the D-Series are expected to contain that information. It shall be possible to charge the subscriber accurately for the service
40、. 5 Interworking requirements The SPNP supplementary service can operate over several networks. 5.1 Interworking with non-ISDNs It is envisaged that the SPNP supplementary service can be used to reach destinations on any non-ISDN with which the ISDN interworks. When interworking with a PSTN, private
41、 numbers (e.g. conforming to ISO/IEC 11571) must be translated to and from E. 164 numbers by the SPNP supplementary service provider. 5.2 Interworking with private ISDNs Private ISDNs can contain multiple PNPs and these PNPs may also contain users which are attached to the public ISDN. Thus, the pri
42、vate ISDN and the public ISDN shall identify the PNP when calls on which the SPNP supplementary service was invoked across the access between the public ISDN and the private ISDN. Recommendation 1.255.2 (07/96) 3 Note that in this case, it is the private network operator who subscribes to the public
43、 network SPNP supplementary service. PNP numbers can also be assigned to accesses connected to a private ISDN. These numbers may be related to the numbers allocated by the direct dialling-in supplementary service, i.e. consist of the last n digits in the number allocated through the direct-dialling-
44、in supplementary service. Alternatively, PNP numbers not related to the direct-dialling-in supplementary service can be allocated to a group of accesses, connecting a private ISDN as individual numbers or number series. 5.3 Interworking with public ISDNs When interworking with a public ISDN, private
45、 numbers (e.g. conforming to ISO/IEC 11571) must be translated to and from E.164 numbers by the SPNP supplementary service provider. 6 Interaction with other supplementary services 6.1 Call Waiting No impact, i.e. neither supplementary service affects the operation of the other supplementary service
46、. 6.2 Call Transfer Assume that user A has an established call with user B and wishes to transfer this call with user B to user C. The numbers presented to the users B and C after successful transfer should be in accordance with the PNP if all users are group members of the same PNP. Otherwise, the
47、numbers should be in accordance with the ISDN (E.164) numbering plan. 6.3 Connected Line Identification Presentation The called user has a private number and can also have a public number. If no ISDN number exists, the default number of the access can be used. The type of number is determined by the
48、 numbering domain of the called number, i.e: - in the case that the call is made to a Member or a Virtual Member of a PNP Group, the connected line identity is the private number. The private number which is presented to the caller shall belong to the PNP of the calling users PNP Group. However, if
49、an E.164 number is provided by the connecting user, the connected line identity is the E.164 number, or as a service provider option the corresponding PNP number will be used. Furthermore, if the call is forwarded into another numbering domain, the connected line identification is the E.164 number; - in the case that the call is made to an ISDN number (E.164), the connected line identity is the ISDN number (E.164). However, if a private number is provided by the connected user, the network shall translate the PNP connected party number to the corresponding E.164 number (if not available,
