1、INTERNATIONAL TELECOMMUNICATION UNION CCITT THE INTERNATIONAL TELEGRAPH AND TELEPHONE CONSULTATIVE COMMITTEE SPECIFICATIONS OF SIGNALLING SYSTEM No. 7 Q.731.8 (OZ9 2 1 STAGE 3 DESCRIPTION FOR NUMBER IDENTIFICATION SUPPLEMENTARY SERVICES USING SIGNALLING SYSTEM No. 7 SECTION 8 - SUB-ADDRESSING (SUB)
2、Recommendation Q.731.8 i Geneva, 1992 FOREWORD The CCITT (the International Telegraph and Telephone Consultative Committee) is a permanent organ of the International Telecommunication Union (ITU). CCITT is responsible for studying technical, operating and tariff questions and issuing Recommendations
3、 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 Recommendations by the members of CCITT between Plena
4、ry Assemblies is covered by the procedure laid down in CCITT Resolution No. 2 (Melbourne, 1988). Recommendation 4.731, 5 8 was prepared by Study Group XI and was approved under the Resolution No. 2 procedure on the 4th of February 1992. CCITT NOTE In this Recommendation, the expression “Administrati
5、on” is used for conciseness to indicate both a telecommunication Administration and a recognized private operating agency. O ITU 1992 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 micro
6、film, without permission in writing from the ITU. Recommendation Q.731.8 STAGE 3 DESCRIPTION FOR NUMBER IDENTIFICATION SUPPLEMENTARY SERVICES USING SIGNALLING SYSTEM NO. 7 - SUB-ADDRESSING (SUB) 8 Sub-addressing (SUB) 8.1 Definition The Sub-address supplementary service allows the called (served) us
7、er to expand his addressing capacity beyond the one given by the ISDN number. The stage 1 service description is given in Recommendation 1.251.8 and the stage 2 functional capabilities and information flows are given in Recommendation Q.81, Q 8. The stage 3 description of the sub-address supplementa
8、ry service uses the ISDN user part protocol as defined in Recommendations Q.761 to Q.764 and Q.767. 8.2 Description 8.2.1 General description network in the access transport parameter in the initial address message (IAM). The sub-address information is access significant information which is transpo
9、rted transparent through the 8.2.2 Specijc terminology None. 8.2.3 Qualification on the applicability to telecommunication services This supplementary service is applicable to all telecommunication services. 8.2.4 State definitions No specific state definitions are required. 8.3 Operational requirem
10、ents 8.3.1 Provision/withdrawal Not applicable. 8.3.2 Requirements on the originating network side Not applicable. 8.3.3 Requirements in the network No specific requirements are needed in the network. Requirements on the terminating network side Not applicable. 8.3.4 8.4 Coding requirements The sub-
11、address is an information element in the access transport parameter. The coding of the information element is according to Recommendation 4.931, 5 4.5.9. The maximum length of the sub-address information element is 23 octets, allowing for the transport of 20 octets sub-address information. Recommend
12、ation Q.731.8 1 STD-ITU-T RECMN 61.731m8-ENGL 1992 48b2571 Ob30871 b57 m 8.5 Signalling requirements 8.5.1 Activation/deactivation/registration Not applicable. 8.5.2 Invocation and operation 8.5.2.1 Actions at the originating local exchange 8.5.2.1.1 Normal operations The basic call control procedur
13、es as described in Recommendation 4.764 are applicable. The sub-address information is transported in the access transport parameter of the initial address message (even in the case when the overlap sending procedure is used). 8.5.2.1.2 Exceptional procedures No exceptional procedures are identified
14、. 8.5.2.2 Actions at the transit exchange 8.5.2.2.1 Normal operation The sub-address information contained in the access transport parameter, is passed on transparently to the succeeding exchange. 8.5.2.2.2 Exceptional procedures No exceptional procedures are identified. 8.5.2.3 Actions at the outgo
15、ing international gateway exchange 8.5.2.3.1 Nom1 operation The sub-address information contained in the access transport parameter, is passed on transparently in the international network. 8.5.2.3.2 Exceptional procedures No exceptional procedures are identified. 8.5.2.4 Actions af the incoming int
16、ernational gateway exchange 8.5.2.4.1 Noml operation The sub-address information, contained in the access transport parameter, is passed on transparently in the national network. 8.5.2.4.2 Exceptional procedures No exceptional procedures are identified. 8.5.2.5 8.5.2.5.1 Normal operation Actions at
17、the destination local exchange The sub-address information is passed on to the user network interface. 8.5.2.5.2 Exceptional procedures No exceptional procedures are identified. 2 Recommendation Q.731.8 8.6 8.6.1 8.6.2 8.6.3 8.6.4 8.6.5 8.6.6 8.6.7 8.6.8 8.6.9 8.6.10 Interaction with other supplemen
18、tary services Call Waiting (CW) No impact on ISUP. Call Transfer (CI) No applicable interaction at this time. Connected Line Identification Presentation (COLP) No impact on ISUP. Connected Line Identification Restriction (COLR) No impact on ISUP. Calling Line Identification Presentation (CLIP) No im
19、pact on ISUP. Calling Line Identification Restriction (CLIR) No impact on ISUP. Closed User Group (CUG) No impact on ISUP. Conference Calling (CONF) No impact on ISUP. Direct-Dialling-In DI) No impact on ISUP. Call diversion services (CDIV) 8.6.10.1 Call Forwarding Busy (CFB) No impact on ISUP. 8.6.
20、10.2 Call Forwarding No Reply (CFhR) No impact on ISUP. 8.6.10.3 Call Forwarding Unconditional (CFU) No impact on ISUP. 8.6.10.4 Call Deflection (CO) No impact on ISUP. 8.6.11 Line Hunting (LH) No impact on ISUP. 8.6.12 Three-Pa?-Service (3PY) No impact on ISUP. 8.6.13 User-to-User Signalling (VUS)
21、8.6.13.1 User-to-User Signalling, service 1 (UUSI) No impact on ISUP. 8.6.13.2 User-to-User Signalling, service 2 (UUS2) No impact on ISUP. Recommendation Q .731.8 3 STD-ITU-T RECMN 8.6.13.3 User to User Signalling, service 3 (UUS3) No impact on ISUP. 8.6.14 Multiple Subscriber Number (MSN) No impac
22、t on ISUP. 8.6.15 Call Hold (CH) No impact on ISUP. 8.6.16 8.6.17 8.6.18 8.6.19 8.6.20 8.6.21 8.6.22 8.6.23 Advice of Charge (AOC) No applicable interaction at this time. Sub-addressing (SUB) Not applicable. Terminal Portability (TP) No impact on ISUP. Completion of Call to Bus, Subscriber (CCBS) No
23、 applicable interaction at this time. Malicious Call Identification (MCID) No impact on ISUP. Reverse Charging (REV) No impact on ISUP. Multi-Level Precedence and Pre-emption (MLPP) No impact on ISUP. Private Numbering Pian (PNP) No applicable interaction at this time. 1992 M LiBb2591 Ubi0873 421 M
24、8.6.24 Charge Card No applicable interaction at this time. 8.7 Interaction with other networks In the case of interaction with a network which does not support the Sub-address supplementary service or which cannot support the sub-address length supplied, the network shall discard the sub-address inf
25、ormation and continue the call establishment procedures without notification to the originating exchange. 8.8 Signalling flows The signalling flows of the basic cai1 procedures are applicable. 8.9 Parameter values (timers) No specific timers are required. 8.10 Dynamic description Recommendation 4.764. The specification and description languages (SDLs) of the basic call procedures are applicable as described in 4 Recommendation Q.731.8
