1、CCITT RECMN*I.25L. B*i(REV*L) 92 m 4862593 0573857 7T4 INTERNATIONAL TELECOMMUNICATION UNION CCITT 1.251.8 (rev.1) THE INTERNATIONAL TELEGRAPH AND TELEPHONE CONSULTATIVE COMMITTEE INTEGRATED SERVICES DIGITAL NETWORK (ISDN) GENERAL STRUCTURE AND SERVICE CAPABILITIES SUB-ADDRESSING SUPPLEMENTARY SERVI
2、CE Recommendation 1.251.8 (rev.1) Geneva, 1992 CCITT RECMN*I.25L- B*(REV*L) 92 m Ll86259L 0573858 630 m INTERNATIONAL TELECOMMUNICATION UNION CCITT 1.251.8 (rev.1) THE INTERNATIONAL TELEGRAPH AND TELEPHONE CONSULTATIVE COMMITTEE INTEGRATED SERVICES DIGITAL NETWORK (ISDN) GENERAL STRUCTURE AND SERVIC
3、E CAPABILITIES SUB-ADDRESSING SUPPLEMENTARY SERVICE Recommendation 1.251.8 (rev.1) Geneva, 1992 POREWORD The CCITT (the International Telegraph and Telephone Consultative Committee) is a permanent organ of the International TelecommunicationUnion o. CCm is responsible for studying technical, operati
4、ng and tariff questions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis. The Plenary Assembly of CCITT which meets every four years, establishes the topics for study and approves Recommendations prepared by its Study Groups. The approval of Re
5、commendations by the members of CCITI between Plenary Assemblies is covered by the procedure laid down in CCI” Resolution No. 2 (Melbourne, 1988). Recommendation 1.251.8 was prepared by Study Group I and was approved under the Resolution No. 2 procedure on the 4th of August 1992. CCIT NOTE In this R
6、ecommendation, the expression “Administration” is used for conciseness to indicate both a telecommunication Administration and a recognized private operating agency. O IT 1992 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or me
7、chanical, including photocopying and microfilm, without permission in writing from the ITU. CCITT RECMN*I.251. 8*(REV*KL) 92 w 4862591 0573860 299 Recommendation 1.251.8 SUB-ADDRESSING SUPPLEMENTARY SERVICE (revised 1992) 1 Definition The sub-adb,essing supplementary senI 2) to invoke a specific pro
8、cess in a terminal at the died customers termination. 2.1.1 Size of sub-address The maximum size of the sub-address is 20 octets. 2.2 Spec terminology Maximum authorized length of sub-address accepted by network (MALSAN): is the maximum number of sub-address octets that the network can accept and tr
9、ansmit. 2.3 Applicability to telecommunications services Sub-addressing (SUB) supplementary service is applicable to all telecommunication services. 3 Procedures 3.1 Provisiodwithdrawal For calling subscriber, provision shall be without any prior arrangement with the service provider. For the called
10、 subscriber, provision may be general without any prior arrangement or by prior mangement with the service provider. Withdrawal is done by the service provider at the subscribers request or for administrative reasons. Recommendation 1.251.8 1 3.2 Normal procedures 3.2.1 Activation, deactivation and
11、registration Not applicable. Note - Registration may be provided by an appropiate user-terminal procedure (because sub-address is stored within the terminai). 3.2.2 Erasure Not applicable. Note - Erasure may be provided by an appropriate user-terminal procedure (because sub-address is stored within
12、the terminai). 3.2.3 Invocation and operation Sub-address information can be provided by the caliing user in the call set-up phase. The service is invoked when sub-address information is sent from the network to the caile (served) user. 3.2,3.1 Calling user side During the Call Set-up phase, the cal
13、ling user can insert the destination sub-address information which is then transported transparently by the network from the originating terminal to the destination terminal. number identification (see the Calling Line Identification Presentation supplementary service). During the call set-up phase,
14、 the cailing user can also insert its own sub-address to complement the calling I Note - Delivery of both these pieces of information from the calling user to the network, is part of the basic call. I 3.2.3.2 Called user side The sub-address that complements the called users ISDN number is transferr
15、ed transparently through the network and sent from the destination network to the called users terminal(s). I This sub-address information is used by the called users tembals in association with the requested service indications to check the ability to accept the incoming call. In the case where sub
16、-address is not included by the calling user, the destination network always provides a normal call offering without sub-address information to the called users terminai(s) (except where other supplementary services apply). The called users terminal which is finally selected for the incoming call, c
17、an also insert its own sub-address in the reiponse to complement the called number identification (see Connected Line Identification Presentation Supplementary service). Note 1 - Delivery of this information from the called user to the network, is part of the basic call. Note 2 - If different kinds
18、of terminals are attached to the same interface, e.g. in passive bus configurations, it cannot be guaranteed that the sub-addressing supplementary service will be processed correctly in terms of terminal selection. Especially in cases where terminals which support the SUB supplementary service as a
19、terminal selection criterion and terminals which do not, are attached to the same interface. In these cases, those terminals which do not support the SUB supplementary service or those which use the sub-address only internally to invoke a specific process, will react to every incoming cail based onl
20、y on the check of the indicated requested service and/or multiple subscriber number (if any and if applicable). At such an interface, the sub-addressing supplementary service procedures may be overridden by the basic call procedures and, if applicable, by the execution of the multiple subscriber num
21、ber supplementary service. 3.2.4 Interrogation Not applicable. 2 Recommendation 1.251.8 3.3 Exceptional procedures 3.3.1 Activation, deactivation and registration Not applicable. 3.3.2 Erasure Not applicable. 3.3.3 Invocation and operation If provision of the SUB supplementary service requires a pri
22、or arrangement with the service provider and if the called user has not subscribed to the SUB supplementary service, the network shall not send a called users sub- address with the incoming call request. When sub-address information is used by the called users terminal(s), then if any value without
23、operational significance is received by the cailed party, the incoming call can be rejected or ignored. 3.3.4 Interrogation Not applicable. 4 Network capabiiities for charging Charging principles are outside the scope of this Recommendation. 5 Intercommunication considerations 5.1 Interworking with
24、non-ZSDNs The SUB supplementary service need not be applicable if at least one of the two parties is not an ISDN subscriber. If the sub-address cannot be transmitted to the destination side, no indication shall be sent to the calling user. Note - The calling user will be aware of the interworking si
25、tuation through normal call procedures and by that means will know that the sub-address cannot be transmitted to the destination side. 5.2 Interworking between ISDNs t In the case where interworking between ISDNs occurs (either public or private), if the sub-address cannot be transmitted to the dest
26、ination side due to different network capabilities, the sub-address shall be discarded and no indication shall be sent to the calling user. Note - It is expected that this situation will occur only for a limited period of time. 6 Interaction with other supplementary services 6.1 Cull Waiting No impa
27、ct, i.e. neither supplementary service affects the operation of the other supplementary service. 6.2 Call Transfer No impact, Le. neither supplementary service affects the operation of the other supplementary service. Recommendation 1.251.8 3 _ - _ I_ - CCITT RECMN*I-251- B*i(REV*l) 92 4862591 05738
28、b3 TT8 6.3 Connected Une Identification Presentation No impact, Le. neither supplementary service affects the operation of the other supplementary service. Note - If the cailing user subscribes to the Connected Line Identification Presentation supplementary service, the connected party sub-address,
29、if provided by the connected user, and the connected party number are presented to the calling user. 6.4 Connected Line Zdentflcation Restriction No impact, i.e. neither supplementary service affects the operation of the other supplementary service. 6.5 Calling Line Zdentflcation Presentation No imp
30、act, i.e. neither supplementary service affects the operation of the other supplementary service. Note - If the called user subscribes to the Calling Line Identification Presentation supplementary service, the cailing party sub-address, if provided by the calling user, and the calling party number a
31、re presented to the calied user. 6.6 6.7 6.8 6.9 6.10 Calling Line Zdentpcation Restriction No impact, i.e. neither supplementary service affects the operation of the other supplementary service. Closed User Group No impact, i.e. neither supplementary service affects the operation of the other suppl
32、ementary service. Conference Calling No impact, i.e. neither supplementary service affects the operation of the other supplementary service. Direct-Dialling-Zn No impact, i.e. neither supplementary service affects the operation of the other supplementary service. Call diversion services 6.10.1 Call
33、Forwarding Busy The sub-address associated with the original called party number shall not be forwarded if the call is forwarded. 6.10.2 Call Forwarding No Reply The sub-address associated with the original called party number is delivered to the original called party and shall not be forwarded if t
34、he call is forwarded. 6.10.3 Call Forwarding Unconditional The sub-address associated with the original called party number shall not be forwarded if the cail is forwarded. 6.10.4 Call Deflection The sub-address associated with the original called party number is delivered to the original called par
35、ty and sha not be forwarded if the cail is deflected. 6.1 1 Line Hunting No impact, i.e. neither supplementary service affects the operation of the other supplementary service. 4 Recommendation 1.251.8 6.12 6.13 6.14 6.15 6.16 6.17 6.18 6.19 6.20 6.21 6.22 7 CCITT RECMN*I.ZSL. B*(REV*L) 92 m 4b2591
36、os73m 934 m Three-Party Service Noimpact, i.e. neither supplementary service affects the operation of the other supplementary service. User-to- User Signalling No impact, i.e. neither supplementary service affects the operation of the other supplementary service. Multiple Subscriber Number No impact
37、, i.e. neither supplementary service affects the operation of the other supplementary service. Call Hold No impact, i.e. neither supplementary service affects the operation of the other supplementary service. Advice of Charge No impact, i.e. neither supplementary service affects the operation of the
38、 other supplementary service. Mult-level Precedence and Preemption No impact, i.e. neither supplementary service affects the operation of the other supplementary service. Priority No impact, i.e. neither supplementary service affects the operation of the other supplementary service. Malicious Call Z
39、dentBcation No impact, i.e. neither supplementary service affects the operation of the other supplementary service. Outgoing Call Barring No impact, i.e. neither supplementary service affects the operation of the other supplementary service. Reverse Charging No impact, i.e. neither supplementary ser
40、vice affects the operation of the other supplementary service. Su b-addressing Not applicable. Dynamic description The dynamic description is as for basic services. Recommendation 1.251.8 5 CCITT RECMN*I.Z5L. 8*(REV*L) 92 = 4862591 0573865 870 9 ANNEX A (to Recommendation 1.251.8) Interim restrictio
41、ns to the Sub-address supplementary service A.1 Scope This annex describes additional characteristics to the Sub-address supplementary service that may be provided by some public ISDN networks as a network provider option. These additional characteristics shail have no impact and shall place no requ
42、irement whatever on the provision and operation of the Sub-address supplementary service defined in this Recommendation by the ISDN networks that do not support these options. A.2 Description For a certain period of time, the size of a sub-address can be limited to a maximum which is less than 20 an
43、d at least 4 octets, either within certain networks or between certain networks. MALSAN shall be the specific terminology that defines the maximum number of sub-address octets that the network can accept or ransmit. The value of MALSAN for the first implementation could be changed to a greater value
44、 (up to 20 octets) at a later date and then be dependent on the requested telecommunication service. In the case where a sub-address exceeds the MALSAN value, the entire sub-address sha be discarded by the network. No additional indications beyond those provided in Recommendation 4.931, 0 5.8.7.2 will be returned to the caing user. 6 Recommendation 1.251.8
